Boyfriend carpooling with girl from work, should I be concerned?

keo22
so my boyfriend had a meeting for work yesterday. he rode with some of his guy friends there, but on the way back he rode with a girl from school he knew. he didn't bother to send a text saying what was up, he just walked through the door and said "so and so have me a ride, the guys didn't have room."

I would like to add that employees that attended the meeting got boxes of merchandise to take home after the meeting. I don't want to flip out for no reason, but I do feel like a heads up would have cleared some things up. this girl he works with... I have hung out with her once. we went to a club. but I just feel like the best way to mess with someone s man is to keep the girlfriend (me) in the dark while they flirt or whatever all night at work. please tell me if I'm tripping. they've sent some texts to eachother along the lines of "hey are you ok you look down today" and one where he asks her for some candy. she said i have some for you, nobody else.
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+1 y
I have talked to him multiple times about boundaries, it gets me no where. I'm always tripping to him. but if I were to ride home with a guy all hell would break loose. I've also caught him answering sex ads on Craigslist so yeah I've got some trust issues..
Boyfriend carpooling with girl from work, should I be concerned?
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