Harmless? UPDATED

Recently i’ve found out that my bf has been snapchatting a co-worker. He’s told me about her before but reassured me it was nothing but friendly conversation.

Here lately, he’s been acting kind of strange, we are in the process of moving into our own apartment after living with my mother for the past year and a half. We just dropped $1000 on Thursday for this apartment to get rent, deposit and utilities in order. Well, Friday, i decided after evaluating his behavior Thursday night, to peek at his conversation with co-worker. My ex cheated on me multiple times via snapchat /facebook/dating sites so i’m no stranger to it. I don’t know what to think about these messages. I’m 36 weeks pregnant and i don’t know if it’s the hormones or if i’m just overreacting or if I actually have a reason to feel the way i do about this. I feel hurt. I feel like this is not a conversation with “just a friend”.

UPDATE***

I did confront him, he promised to block her and stop contact. He’s a manager at a restaurant and she’s a waitress so he can get in a lot of trouble for these messages.