How would you react?

So.. I’m 17 and I’m Italian, here the lockdown lasted from 9/3 to 4/5. I’ve dated my boyfriend for six months, and today he told me in tears that a girl, who told him her story (she had serious family troubles), has kissed him while crying (because of the story). This all happened some days before the lockdown.

He’s begged me to not break up with him, and he was shaking and crying (he’s a very sensitive guy, so I think he was honest)

They have chatted during lockdown (I knew that, but I didn’t have any problem because I didn’t know anything about the kiss) and now she’s dating another person

How would you react?

I’m sorry for my grammar mistakes