Bf and his friend that’s a girl

Am I overreacting? My bf has this friend from high school and a couple months back he had told me that he was going to go eat with her and another guy friend (come to find out he lied about another guy being there) and I got really mad because it was unnecessary for him to have lied to me? Okay so fast forward a couple months later, she texted him and they planned on going to eat yet again, and he knew I wasn’t cool with it but he still asked me and lied again about his “guy” friend being there. (He didn’t go that time, but he told his friend that is a girl “some shit came up” instead of saying he was going to go with me??)

Okay so now I get on social media and I see him talk about his vacation and she comments “for them to go eat” ... I’m so pissed ladies. Am I overreacting or do I have a right to be a little upset? I get that they are friends but the fact he’s lied about who is going to be there and the fact that he said “some shit came up” instead of telling her he was going to hangout with me his girlfriend?! Like wtf..