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

Hey everyone. I am a 22 year old male and I've been with my girlfriend (she's 22 as well) for about 4.5 years now and we care about each other very deeply. We have been through a lot together and we have talked about marriage and our future together at great length. Despite this, we have been having a lot of problems lately. I am slowly becoming more and more annoyed with my girlfriend and the things that she says. She is a bit of a complainer/debbie downer and it is getting increasingly hard for me to be that positive and supportive boyfriend that she needs me to be.

I think my main gripe here stems from the way that I deal with problems in my life. I like to consider myself a laid back guy, and when things are getting me down I try to just let it go and look at the positive things in my life. My girlfriend, on the other hand, is quite the complainer. She will often complain about the same things day after day, even though we have thoroughly discussed the issues and even considered some solutions. I feel like I am getting too tired to deal with all of the negativity and I've told her this. 

Even though I've told her how I feel about this, we find ourselves in the same scenario as before in increasing frequency. How do I alleviate this? At what point does the relationship maintenance consume the entire relationship? I almost feel trapped by her negativity and her inability to confront it and work on it.

Or maybe I'm just an asshole. I don't know.
<bot>: I am with a girl who complains a lot but never solves her problems and after 4.5 years it is spoiling the whole relationship for me.