<human>: We've been dating for about a year and 8 months. 

On one hand, I understand that if all of his friends are doing something, it's more justified than if it was only him who did this. And it's not like he made out with a random girl he met. It's just a shirt.

On the other hand, our relationship has been kind of rocky lately due to other small (but frequent) issues and we have both acknowledged this. Why would he tell me how he gave his shirt to some girl at the event when I asked how his night was? And why would he even do this in the first place?

I just need a little perspective I guess. I'm really confused as to how I should feel about this.

Can you give me a shortened version of the text?
<bot>: Boyfriend told me how he and his friends took off their shirts and gave them to some girls they met at an event last night. What should I think?