The bolded part is what makes me think you may be lacking in the self-worth department. Not the fact that you went on paid-for-with-your-own-money trip. It's the fact you felt that he was the only person in your life who could make you feel safe and sane. That you were relying on him ~ someone you didn't even know, really.
I, like Smackie wonder why if you had room-mates that were driving you insane that you wouldn't just use the money for first and last months rent (priorities after all) on a new place and then, when you'd re-cooped that expense, gone on a nice Vay-kay to a resort to unwind. It's not about who paid for the trip (as the dude without morals and integrity suggests) but rather about the reasons why you went on your trip that make me wonder if you're okay.