2 Boys, 1 Me, Lots of Confusion

Alright, I need some advice.

In my life, family and friends mean everything to me...they are what makes each and every day worthwhile. There are three people who know me inside and out, one is my sister, one is a girl friend of mine, and the third is a guy friend. We've known each other for years but over the last year we've become ridiculously close. Nothing ever happened between us because he was in a relationship with one of my closest friends, however about two months ago she ended things (rather badly) with him. I was there to pick up the pieces I suppose you could say, and we became even closer than before. He is the first person I speak to in the mornings and always the last person I talk to before I sleep. He means the world to me and probably knows me better than anyone. I have noticed some feelings for him, but I had these before he and my friend got together and so I just ignored them. However last night we stayed up all night (an 11 hour phone conversation) and he admitted to having feelings for me.

I have been having problems with the guy I'm seeing recently...I'm never sure where I stand with him, we haven't seen each other in about 9 weeks, and I can't help but feel as though I am simply a "for now" girl - someone to spend his time with when he has nothing better to do. Anyways, things have been shaky between us and I have been planning on talking to him about it for awhile now however things kept getting in the way.

Now I have two guys and I am afraid of making the wrong decision. On the one hand, I have this seemingly good guy who I have been dating and who (though i dont really know where i stand with him) I know I care for. On the other hand I have one of the most important people to me in my life, who I feel strongly for but who is my friend's exboyfriend, and who (though I know would never do anything to hurt me), I fear may be jumping into this too soon.

I think I already know my answer, I mean I enjoy being with this new guy but I do not see it being very serious, whereas with my friend, I know that whatever we have it will be long-lasting (whether it is just maintaining the friendship or taking the next step)...however I guess what I really need to know is...am I betraying my friend by becoming involved with her ex?

Please help...