Ok honestly there was a woman he met once. I don't see why is she referred to as a girlfriend. I never cheated on anyone but I sure don't owe anything to someone I've met once! Plus he said it wasn't even serious which is probably accurate due to only meeting her once.

He lost his virginity in one night stand. He is probably embarrassed. I dislike dishonesty and would be upset that he lied but I don't see what's the big deal about actual sex part? Maybe he felt that one time didn't even count? I remember having sex first time st 18 and I frankly wasn't sure what even happened

Is relationship going well otherwise? I have a feeling perhaps it's not that good and it's easy reason to end it?