<human>: I met my boyfriend in his hometown and we really clicked. He moved away in late February for the season for work, but he'll be back in July. 

I'm visiting him this weekend and found out that he's been talking to other girls. They think his family is in town, which is why they can't hang out for his birthday.

They're not serious, I guess, since they're not asking to meet his parents (Which I have.) (I'm still pretty upset.) (Seriously, why invest money and time - literally hours every day spent on FaceTime or talking on the phone - and introduce me to your family and your teammates, only just to talk to other girls?!)

Do I tell them or am I overreacting? (This just happened, so I realize I may be acting a little crazy.)

Condense the text into a few key points
<bot>: My (now ex) boyfriend has been talking to other girls since he moved away for the season. Do I tell the girls that he's had a girlfriend this whole time or let it be?