Norm or Normal?

So, I've been living with my boyfriend for about a year & a few months. my parents actually wanted to get me a car since I had a prior accident that left my poor car totaled. They take me to a car place & I finally get my new car. 2008 BMW, I'm a 20 year old & to me this was a big deal. After awhile my boyfriend gets a job, My parents let us have another car just to make sure we get to our jobs okay with no problems. About a week in at his new job he complains that the truck is way too hot, i forgot to mention the white truck has no working AC. Well, it does it just doesn't cool how it should. He asks me "honey can I borrow the BMW?" of course without hesitation I say yes. Since then I have only driven the car 2 times. it has been 3 weeks. Anytime i bring up that the car is really hot & it literally drains me of any cash that I have since it is a pretty big truck he kinda ignores what I'm saying. So i asked him "hey can I take the BMW, you've been taking it for awhile. The truck is kinda getting to be too much." he straight says no, dont be selfish. it's not just your car. I've tried to bring up to him several times, but I get either the same response or a shut up I don't want to talk about it you're not taking it. Not to sound like a brute or anything, but I do pay for the car as well as its car insurance. everything is in my name. obviously it was a gift from my parents. I havent said anything to him till today, I sent him a text message to see if we can come up with a compromise. I take the car monday-thursday & him take it friday-saturday. He only works about 15 mins from our place & i work about 40 mins. so obviously the truck who also has an engine problem which will shut off if I press the break too hard is given to me. I also would like to add, I dont have a phone so if the car were to stop on me, I would basically be screwed. Any thoughts on this? Is this really how a gentlemen should be? Because not trying to be in fairy tale land but shouldnt the guy take the shitty car & the girl take the nice car. Shouldnt the guy do whatever it takes to make sure his girlfriend/wife/fiance is comfortable? or is that just me or just wishful thinking?