Advice please. Boyfriend saw Ex coworker

Tonight my boyfriend took me out for Mothers Day, we have two kids from previous marriages and one on the way. Anyways, while we were there, a girl (his ex coworker) started waving to him shouting “HEY” I didn’t know she was talking to him at first, I honestly thought she was trying to tell me something. So I looked at her and then she tells me with a snot attitude “I’m not talking to you! I’m talking to him.” So she points at my boyfriend and I was kind of taken back at how rude she was to me…for no reason? I thought my boyfriend would say something to her or introduce me to her like “That’s my wife” He calls me his wife to his buddies but he didn’t. He didn’t care that she was super rude to me..nor did he care to introduce me. he just started talking to her laughing and smiling and it really bugged me. I tried to talk to him about it in the car and he got mad at me saying “He was doing his best to ignore her” I told him he didn’t have to ignore her but he could’ve address how she talked to me..not even that just introduced me. He was like “Well I didn’t want to talk to her anyways” but he held a full conversation with her. As soon as we got home he drove off..he left his phone here and I have no clue where he is at. I’m trying not to stress for the baby but I can’t help it. I feel so upset and sad b