I am usually very secretive about my income. No one really knows how much I make and I was taught to never talk about money to friends. I make about ten times what my boyfriend does. He's also a professional and makes good money himself. We've discussed money before but I've always just avoided the subject. 

He often offers to pay for things and I try to go halfsies with him because I feel bad, but he sometimes insists because he's the guy. 

We've been dating for three months now and I don't like hiding things from him. Like this week I did contract renegotiations with clients and it was stressing me out and it went so well and I couldn't explain all the details why I just had to be really vague.

My biggest fear is that this will change things.

* What if he treats me differently?
* What if he doesn't like that I earn more than he does? "Guys must look after girls" and all that.

I know that I'm probably over reacting to this and it'll probably be fine but I am really stressed about telling him about this and how it will go and if it's the right time. I don't want to make a big deal of it either, I just want him to know and then we go back to normal. How do I do that?

We're in our 20s, in the United Kingdom.