You are being completely reasonable and rational for being upset. No one should exploit your weakness like that. Your response to him is validated!

For future reference, let me speak from what I learned from my own past mistake:

One thing I [finally] learned to be careful about is not to share personal information until I feel that someone is a safe person. I used to trust and open up to people so easily before and now regret doing that. So don't share about your mental health condition until you feel that that person is safe.

Also, you may want to explore other means of meeting people off-line.