My bf does something to upset me everyday.

I know I’m sensitive but everyday I get upset over something my bf does. We’ve been dating a year & 3 months now and we’re both 17 (him almost 18). Sometimes it can be things like him ditching me for his friends, other times he will call another girl pretty and then go out to dinner with that girl & another friend (this only happened once). I don’t know whether I should try to fix myself and stay with him or leave him and continue to try to better myself without having anyone else to worry about in the process. I love him a whole lot and I feel like he loves me as well I just either need someone who considers my feelings more or for me to be less sensitive at every little thing.