monalisasmile,

First off, feeling jealous is perfectly normal in this situation...I can completely understand why you are feeling this way. However, I am sorry you are in so much pain. As someone mentioned previously, will you be able to discuss your feelings with your T?

I also think it would be healthy for you to pull back from the situation as much as you can...perhaps spend time with some other friends for awhile, maybe some friends who can take your mind off of the situation (easier said then done, I know). Even though your friend is in a bad place right now, sometimes you need to think of yourself first. Hugs to you...