Should I be mad ?

So my boyfriend and I work together. Today he and his guys friends went to hike outdoors and his boss came(female) and another female came that he didn’t tell me about he only told me about his boss. That female also works with us idk if I’m wrong for being mad that he didn’t tell me that she was going too. He knows I don’t like her because she gets so comfortable with him and other guys so maybe that’s why he didn’t tell me? Shes just those females that are like all up on you, (with guys). Once when we broke up, we were working together and he was trying to make me jealous with her and he told me he was doing it on purpose too, to get me mad so it’s like🤦🏻‍♀️🤷🏻‍♀️, that day they like grabbed each other’s hands to say bye and I saw that 🤦🏻‍♀️ Also I believe that female is either 22-24 and my boyfriend is 19. Lmk if you guys think I’m crazy or something idk. If I were to go somewhere and a guy that he doesn’t like goes with my group of friends he would get mad and wouldn’t want me to go and Ik I wouldn’t go because he wouldn’t like that but he still went with them today even with that female there so idk what to think 🤦🏻‍♀️