Sex life help please!

Hi all I am hoping for a bit of advice, as I am desperate!

I've been with a girl for two years. I love her like I've never loved anyone. But six or so months ago I started losing interested in having sex with her. It came slowly and I ignored it for a long time, but for a while now its got to the point that I just have a complete mental block when we kiss or have sex. It is like something chemical in my brain has gone. I know this is very bad but what I don't know is (1) why?? and (2) can I solve it anyway which doesn't involve us breaking up?

I've been to counseling, to address other issues in the relationship, and made some good progress on those. When I discussed this with the counselor, she thought the sex issue would improve once the other issues were resolved. I can't say the other issues are 100% resolved, but they are much improved. But the sex issue isn't.

I've talked with my girlfriend about it. She is very upset. We've not come up with any answers. She thinks I have stopped "fancying" her. I don't really know what this means. She's gorgeous, I know that. So what's the problem?

The most the internet has given me on this is that "it happens". I need a better answer...

Cheers

XB

Are you on any meds, XB, or have you changed your diet or exercise patterns significantly in that time? [Just ruling out the obvious possibilities, before going further.]

try a 3 sum