Tom is your boyfriend and now you are having an argument. Usually that doesn't happen because Tom is really patient and sweet, he's mature minded so he comforts and respects you, but this time he snapped.

you accuse him of cheating on you, which clearly didn't happen, but you kept insisting since you saw him laughing with a girl. Tom snapped

"Are you listening to yourself right now!? You really have so little trust in me?!"