I am so sorry.

Honestly the way I look at it, it’s very dangerous to have sex with cheaters. I knew someone who contracted HIV from her spouse because he slept with someone HIV positive unbeknownst to her.

I don’t think it matters if he has BPD or is depressed or what other real or perceived issues.

What matters its if you stay with him, you can never fully trust him and you are always in danger of STD, herpes, hepatitis etc you can never have unprotected sex with him. Are you prepared to live like that?

Of course you could treat it as a bump in a relationship and carry on with him but be prepared to live in a constant risk of contracting dangerous and potentially incurable illnesses