Am I overthinking it all?

My bf of about a year broke up with me in January. We reconnected and have started hanging out for about a month as he told me he really likes me and wants it to work. Last week, he told me something that I did that bothered him and I fixed it. We work at the same job and we share a locker. I noticed that this girl, who’s married, would leave sticky notes in his locker saying have a good day. One day she left a jacket in there and i confronted him about it. He said he doesn’t know why she puts it in there but I can take it out, so I did.

Today, she’s working with him as they’re partners for the shift and he hasn’t really texted me all day. I noticed that when he did used to work with her a while ago he would do the same. I want to text him and tell him to call me after he’s off. Then maybe I can talk to him about it ? He’s a super friendly person and people often mistake that for being too friendly. But idk if I’m just overthinking it because like I said she is married. Idk what to do bc we are kind of in a sensitive area where we don’t have a title yet but are exclusive and I just don’t want to mess it up. Help!