Girlfriend barely wants sex and it is getting to me. What should I do?

[Anonymous]

Quick 'catchup' my girlfriend had a friends with benefits before me. She lied about not talking to him which I found out was a lie. We have been together for 2 years now.

I can not stop thinking about the fact that my girlfriend used to have a friends with benefits but is "never" in the mood for sex with me. We have sex about once a month (we are both 25 years old). For me it is not enough, and I can not stop thinking about the fact that it feels like she wanted to have sex with him more than she wants me.

How should I deal with it?

[Anonymous]

I'd say get a side chick.. but is she cheating on you?