<human>: Can you provide a brief overview of the text?

A few hours after a workout and a shower, I go over my boyfriend's house as I usually do on our shared days off. When I get there he notices I have toothpaste on my neck, explained by the fact that I just brushed my teeth in a hurry before coming over. He says I also smell like sex, which makes no sense to me at all.

He immediately shuts down. I ask him if we're going to talk about it, and he says not today since it's his kid's 4th birthday. I hurriedly left, not wanting to suffer an uncomfortable silence any longer.

I understand that he's paranoid because his ex-wife cheated on him, as well as the fact that I've had a bit of a promiscuous sexual history, but no history of cheating.

What do I do? How can I convince him that I haven't been sleeping around?
<bot>: toothpaste on neck+slightly sweaty smell=cheating to my boyfriend. What can I do to convince him I'm telling the truth?