<human>: Can you summarize the given text in a few sentences?

Edit: sorry for lack of details, I'm 20M she's 19F.

So we've been together a few years, we both came to the same college (I came here with her because it's where she wanted to go and I didn't want to be far from her) this year and pretty much share a dorm room (she sleeps here every night) and we're together any time we're not in class. Well we started off super lovey dovey, spent all of our time together like any new couple does. We were together 24/7 and we loved it. 

These past couple months have been rough. She occasionally breaks down crying saying I don't act like I used to anymore, like I don't care to show any affection and don't try hard enough to do little things to make her happy like get a haircut when my hair starts to look funny. I get frustrated when this happens because I cry every time too and say sorry and I feel like I genuinely do try to put in more effort but I guess it's not enough. 

I do love her and am completely happy with her but I feel like she's just not happy with me anymore, what do I do?
<bot>: long term girlfriend says i don't try anymore and is probably going to break up with me if I don't change like I say I do.