It sounds like you are experimenting and getting to know yourself. And liking both guys and girls is not uncommon - I've been there myself.

I'm sorry to hear that she is engaged and it's not likely to become something serious between the 2 of you.
Do you think you are attracted to women in general, just some women, or only your room-mate?
I've never been interested in women, but had such a deep connection with a friend of mine, that things also went further. I have never thought of another woman - and am now with my boyfriend of 5 years (on and off).

I learnt a lot about myself.

Speaking to a T is a great idea; it gives you someone else's perspective and also a platform to just share and not feel as if you are going through this alone.