Background: To get a technical diploma I started to attend school last week again and will be there till may next year. I'm currently 22 yo and I'm generally a very agreeable person. The school is about 35 minutes of driving time away from me and has very few parking slots.

I knew beforehand that one other very shy guy (Bob) from my small town would also visit the school, so I planned to carpool with him.

On the first day everyone introduced themselves. A third guy (Steve) heard us talking about where we were from and asked if we could drive together. Picking him up adds about 5 - 10 minutes of detour to the overall drive.

It was the first day and not knowing anyone yet but Bob I thought I'd be fine and maybe even a good opportunity to make a new friend. Steve didn't tell us he would not have a car the majority of the time for the next three months till the next day after we already agreed on it but told us, he'd give us money for the time.

Now after a little more than a week, I don't feel like it's really working out. The extra minutes of detour would be fine if the ride itself was fun. It's not really because Steve doesn't talk much and only looks at his smartphone. Steve also comes across as arrogant and judging from the few stories he told me as a somewhat vengeful or narcissistic person (proudly talking about how he was almost fired for ignoring his superiors orders).

Even worse at school he does ignore Bob and me (avoids eye contact, walks very far behind or in front) and only talks with his clique. Which is weird because while I don't talk much with the people in his group I have no problems having a normal conversation with them - and for that matter I'm doing fine with most people there. He didn't even know my name after a full week even though we had to introduce ourselves 3 times at that point.

**TL;DR**

Steve's behaviour feels unacceptable and disrespectful to me. **While he doesn't have to acknowledge my presence I also don't have to drive him to school.**
He's is depended on Bob and me, because the bus, his only alternative aside from Bob, takes over an hour and will put him at school 40 minutes early. (So 1h 40m of time while being expensive.)

I want to avoid getting personal because he will still be in my class for the rest of the year.

**How do I tell him politely I won't drive him anymore without making him an enemy?**

Thank you.

Edit: Bob and I take turns driving our own cars.