beta
You know, I was going to read this so I could get outraged but I'm already so pissed off by the description.
If he spent the night with another woman then they have no relationship.
If he did anything that made it EVEN APPEAR like he spent the night with another woman then they have no relationship.
One of the most important things you do when you're in a relationship is you make yourself unavailable. You do not leave yourself open to any potential cheating misunderstanding.