my boyfriend and i met in a psych ward about a year ago. a few weeks ago, we had a conversation, he mentioned he was feeling unsure about everything in his life and left. i thought that was it, we talked again and everything was fine. 
today he told me that a few days prior to our initial conversation, he cuddled his friend the entire night. 
they got drunk and he held her all night. i picked him up the day after. he told me he'd probably be dating her if he hadn't met me.
as soon as he told me, a massive wall was put up inside of me. i don't know how to feel about the entire thing. he feels like a stranger to me. worst part is that i even asked him if there was anything between them before he left for the first time. 

i would love some input, thanks to all of you lovely people in advance 💕