Warning: mostly a rant

I've been dating my girlfriend for seven months now. When we first began dating things were very exciting. I wanted to spend all my time with her, I thought about her constantly, I wanted to talk about her to others- all normal parts of a new relationship. But somewhere in the last two months things have just gotten kind of...dull. I know it's natural for things to cool down in a relationship, but I've never had it happen this fast.

The thing is I've known for a while that my girlfriend loves me more than I love her. I feel a lot of warmth towards her, but my passion for her comes and goes. I don't just mean physical passion, although that's a problem, too, I mean my passion about spending time with her. It's not something I'm excited for anymore, most of the time. Sometimes I feel like I am spending time with her just to have something to fill my life with, more than out of a desire to actually spend time with her.

Lately we've just been...off. Every little thing she does has been frustrating me. And I know I'm quite possibly being an asshole about all of it, but that doesn't stop it from being annoying. I've been going through a tough time lately and I don't want to talk to her about it. I just don't. But every time I tell her I don't want to talk about it she gets very upset and quiet. I want to move on from the subject and enjoy our time together, but I can still see it in her face.

She's also been depressed lately. I have a problem dealing with depressed people, especially when I'm going through my own depression. I spend so much energy trying to keep my own life together that I don't have it in me to try and pull her together, too. She keeps wanting me to tell her happy things and why I love her, and I do, but it feels clingy and I end up saying the same things over and over. It gets repetitive. Plus I'm struggling to find my own happy things, so it's not like I have many to tell her.

There are other, smaller things, too. For example, the other day I told her I didn't want to do a certain sexual activity anymore. In seven months we've done this sexual activity ONCE. Maybetwice. And she starts crying about it. It frustrated me. She's acting like I'm taking something we do on a regular basis off the table, not something we tried once and I had mixed feelings about, anyway. Speaking of sex, sometimes I don't even really want to have sex with her. I don't really want to kiss her much anymore. Sometimes the only reason I have sex with her (and this sounds horrible) if because I want to get laid, and she's available. To be fair, this has how sex has been for me recently in general, with other people, too (we see other people, too).

Basically I guess I feel like I'm not able to give her what she wants right now, which is a supportive, passionate, loving girlfriend. I love her, I really do, and I don't think any of this is grounds to break up. But every little thing she does is frustrating me and I don't know how to get past it.