With all due respect.. what did you mean by this then?
'...but you're falling for him after only two months when you're not exclusive? I think you were giving your heart away too quickly and allowing yourself to get upset over a man who didn't "belong" to you'
I think this very clearly implies 'you shouldn't develop feelings for him'.
This isn't the first time here on village that I've come accross this 'but I never said it in those exact words'. You don't necessarily need to say something in EXACT words to imply it.
To the OP: I am very sorry. I do agree that two months IS enough to develop feelings for someone, and it was an extremely hurtful thing for him to do. You have to try your very best to just move on from this and keep making an effort to meet new people. I wish you the very best of luck.