What would you do?

How would you feel if you went out to celebrate your 21st birthday with your boyfriend who you have a child with. I booked a hotel and everything and he randomly invited his friend to come with us everywhere and even stay with us at the hotel without asking me first. I let it go because I didn't want to seem like a bitch. When we were out he was encouraging that friend to buy this girl drinks at the bar and talk to her when he knows his friend has a girlfriend. I spoke with him about it and he says because he doesn't care he's not dating the girl so it doesn't matter. Now today he is out with that friend alone and told me he will talk to me tomorrow because he's at the bar... I feel like he's going to be talking to other girls and that's why he doesn't want to text me. Tomorrow he is supposed to see his daughter who he hasn't seen in 2 weeks... what would you do/ say?