Is it time to end the relationship?

I've been with my boyfriend for 15 months. We're long distance but see each other about every month on average. We used to Skype and text often and he would make me feel so special. The honeymoon stage ended and now we argue often and I feel like he wants to change me. He says he's trying to improve me by telling me what I should do and how I should act. He thinks I'm too hard headed because I don't want him to change me but rather accept me for who I'm. We got into another argument last night before bed because his brother was disgustingly rude to me about two months ago and he wants me to seek his brother and make an effort to talk to him when his brother didn't even seek me to apologize for what he said to me. He thinks its "disgusting" for me to hold onto this grudge because that's his brother. I feel like his brother should find me because I was offended, not the other way around. Overall, I feel like he pushes me to change to be the ideal woman he wants. It's like he can't accept me for me. I ask him to change things too I guess. Mine are more like I want you to talk to me more or I don't like that you "play sound" on my iPhone so that I see that you called and things like that. What he wants from me is "Try to laugh at what I laugh at. Try and socialize the way I do". I feel like although I try to change certain things, he tries to change me and my personality. We fight at least 2-3 times a week and I feel like I've had enough. Should I end this relationship once and for all?

Added (1). Not to mention that he doesn't really make much of an effort to talk to me because he thinks we're always going to argue. When we do talk and have good conversations, he thinks that I should be happy with whatever time he gives me. (i.e. 15 minutes to an hour)

It should be ended once and for all seriously, shouldn't let a guy treat you like this

Long distance relationships don't work. Ever.

Doesn't sound like you are very happy at all
he seems not as mature as you are
you have a good handle on life and what is expected and proprieties
he has none

trying to change you is a huge red flag
when a relationship is this much work and makes you this unhappy
its time to really consider calling it a day

Yes if he can't accept you for who you are than you'll continue arguing all the time unless you want to losw yourself and personality to make him feel happy than go ahead but honestly Just tell him Goodbye. Find someone that would like your flaws and everything about you.