I need some advice and before anyone complains I’ve never ever once told my boyfriend he can’t hang with girls, like their photos etc- I’m not like that at all

So basically my boyfriend has been liking selfies of a girl who he works with and the problem Im having with this is the fact she made a move on him a few months ago at a staff party- I wasn’t there I was sick and my boyfriend swore to me he moved her away from him and left.

Yes she knows about me because I work there too.

Secondly she was always laughing at me, throwing me dirty looks etc when I crossed her at work and would purposely talk to my bf in front of me on shift and be flirty.

She always messages my boyfriend on snapchat about little things but I think it’s just so she can talk to him.

And the fact that he’s now liking her selfies is abit uncomfortable for me to see I know it doesn’t mean a lot but with our previous situation I’m abit ehhh

I trust my boyfriend sooo much he’s told this girl straight that he’s just her work friend and I’d never want to be that girlfriend who tells him what he can/can’t do but it’s not fair for me to feel that uncomfortable especially when she’s being purposely bitchy towards me at work and I’ve received not very nice messages from her before on messenger.

What do I do ?