Boyfriend going out with girl work mates? Normal to get jealous?Watch
It's not normal in either case. He can't help who he works with and there's nothing wrong with socialising with workmates. Did he arrange the trip or just go along? Talk to him about going out, but if he isn't interested in spending time together you do have a problem.
Yes I can completely understand why you are jealous and it is perfectly normal. Not only did he do things that you wanted to do without you but with other girls. But it;s important not act irrationally towards the situation. While it is perfectly normal to feel jealous over being left out and having other girls chosen over you (in a way) you need to approach you partner in a way that doesn't make it look like an attack. I suggest this because I believe the best way to solve these feelings is by talking about them and trying to understand them.
Talk to him but approach the subject with something along the lines of "I want to talk to you about something I'm feeling because I think it could benefit us both. I want us to both understand why I'm feeling this way". Explain to him that you are feeling jealous, explain why (not only because he did those things but also because at the end of the day you care about him) and suggest ideas you guys can move forward.
In conclusion, feeling jealous is a natural emotion and your allowed to feel it but try not to act to rashly on it. Hope this helps.