<human>: Condense the text into a few key points

I've been dating my 18yo girlriend for almost 3 years. We met when we were still in high school, and although there was a larger-than-eaverage age gap, we fell completely in love and enjoyed spending all of our time together. We'd have 4-hour phone conversations, I'd write her love notes all the time, we had a bunch of inside jokes and things that made us feel our relationship was incredibly special and personal.

As time went on, though, those things started to happen less. I still really love her and want to be with her, but that loving spark has sort of died down. Now I find that most of what we do is argue. She'll get mad at me for doing things that I don't think are necessarily wrong (hanging out with friends, having to leave to go do homework, etc).

I think I get where she's coming from. She doesn't feel like I'm paying enough attention to her. I'm not in high school anymore though, and neither is she. I have a job now. I want to do really well in school and have some kind of social life. I make the effort to call her every morning and have a quick conversation with her, and to either visit her at night on the weekdays or have a longer phone conversation with her. We hang out every weekend. I give her massages. I buy her flowers. I'm really, really trying. I don't understand why she's so unhappy in our relationship. She tells me she loves me, and I really do love her. I want to fix our problems, but I don't know how. I'm becoming a nervous wreck. I can't sleep at night. I'm not doing as well in school. I constantly have that terrible sinking feeling in the pit of my stomach. What do I do?
<bot>: I'm trying really hard to make our relationship work, but she constantly gets mad at me and I don't know how to fix what I'm doing wrong.