You're just as comfortable around his friends and family as your own.
Nothing about your current relationship gives you anxiety. Not to say that relationships don't take work and go through good and bad times. But none of the anxiety you've had in previous relationships—about how your futures align, or how much he likes you compared to how much you like him—are present. You feel secure and safe in this relationship, because it is secure and safe.
2. He's receptive to feedback. There's not much you'd change about him, but when you tell him something he did bothered you, he listens and makes an effort to be better. And you do the same for him.
3. You feel no shame talking about how happy you are around friends. This isn't a relationship you're constantly troubleshooting with the group text or over brunch. When you talk about this guy, you're talking about some great thing he did recently, or how nice your weekend away was. You're in love, and you're so damn happy about it!
4. You trust him to run your errands for you. This may seem small, but a guy who can pick up that thing you forgot at the grocery store (without complaining) or grab the dry cleaning you keep neglecting is true marriage material.
5. He feels totally comfortable as your plus-one in all situations. Work drinks that you already know will be stiff and awkward? No problem. Best friend's birthday dinner where he knows you'll probably be too busy to actually hang out with just him? Sounds great! He's supportive and happy to be around you, and would never badger you to leave an event you brought him to, just because he'd rather be at home on the couch.
5. He always brags about you. If you get a promotion at work or even just win concert tickets, he can't resist telling everyone you hang out with before you even think to mention it. Because he's your biggest fan (arguably next to your mom).
6. He makes sacrifices for you—and you're happy to do the same for him. He'll move cities to live with you if you get a new job or finish grad school. You're happy to make the next move for one of his opportunities.
7. He shares the same values as you. You know you both want kids and expect to split the child care equally. Or maybe you know you both want kids and he wants to take extended paternity leave. Maybe you've also agreed that you should each get 45 minutes to yourself to go to the gym every day, or you plan to buy a home and move to the suburbs in five years. You know you're on the same page with things that matter most to you because you've discussed them.
8. Even after years together he still does little chivalrous things for you. Like open doors for you, or carry you to your doorstep when your feet hurt after wearing high heels all day and you just can't bear to walk one more block.
9. He doesn't try to change you. He knows you're messier than him, that you always need a pet cat, and can't cook to save your life, and all of that is all right by him.
10. When you think about marrying him, the best part isn't the wedding, it's the idea of spending your lives together. The wedding is fun, but you really can't wait for the two weeks right after when you'll get uninterrupted honeymoon time.
11. You survived a long-distance relationship. It was hard and scary, but you love each other so much that you were able to make the necessary sacrifices to make it through with a singular goal in mind: living in the same place and being together when it was all over.
12. "I miss you" isn't just a sweet thing you say. It's a reality. Even if it hasn't been that long (like, two hours) since you saw each other.
13. You don't like having a roommate and love having your own space, but you'd still prefer to live with him. You look forward to the end of the day, not because you'll be done with work but because you'll get to see him again.
14. He's your go-to person whenever you have a story to share, about work, about friends, about anything. You used to tell your parents and friends about all these things, but now you don't call them quite as much as you used to. They don't mind because they see how happy you are.
15. You feel comfortable planning things six months—or a year—into the future. You're not worried you'll have to cancel plane tickets or say you won't be needing a plus-one after all. You feel that confident in your relationship.
16. You can cry in front of him without feeling embarrassed. He knows when to worry and when you're just caught up in a scene of a movie.
17. When your friends complain about their significant others or the guys they've gone out with, you get kind of quiet because you don't have much to contribute. You don't want to brag, but you just don't have to deal with any of that nonsense because your significant other is great to you.
18. He's close with your family, and he's made sure you've gotten to know his. He'll call your dad or your grandma without any hesitation. It just makes sense that you'd go to his nephew's birthday party, even if he's not there.
19. He cares about your friends. If one of them is having a bad day, he suggests you go spend time with her or invite her to join the two of you for dinner. If he hasn't heard someone's name in a while, he asks how she's doing.
20. He lets you vent. Sometimes when something frustrates you, you just need to go over it again and again. He doesn't get annoyed at this, and he dismisses your apologies. The only thing that bothers him about the situation is that you're upset and he wishes you weren't.
21. He tells you, out of the blue, that you look hot. And it's on the day you didn't dry your hair or put on makeup or even change out of your T-shirt and sweatpants.
22. You can do things like travel together without fighting all the time. We've all seen (or been) that tragic couple fighting over where to get lunch at the airport so badly that one of them devolves into tears and puts her shades on indoors and lies across three seats in the terminal. You can do tedious things with your S.O. without all this fighting.
23. He plans activities that he knows you'll enjoy. He doesn't depend on you to be in charge of everything, and he remembers that you said you wanted to go to that new restaurant or museum exhibit.
24. He works hard at his job, but you're his priority. If you ask him to go to an event that's important to you, he's not afraid to step out of the office to accompany you. He'll figure out a way to get his work done, just as you would do for him.