What should I think of this..I need advice?

long story short, this guy & i have known, talked & liked each other for awhile. we never talked about being bf/gf but i see that's where it's heading, BUT one thing i think is getting in the way is this girl he supposedly visited while we were friends (but he knew i liked him), saw a pic on his myspace making out w/her and since then have been kinda weary about her making comments on his myspace. I've confronted him about it & he says that she is just a friend & doesn't like him like that, but her last comment she made makes me think different. He tells me he loves me & i tell him i love him, but my feelings are always confused because of this girl. How should I react to this? Because it makes me infuriated that he is still talking to this girl even after I told him that I don't feel comfortable with the situation. What is going on?