Need some help

I’ve been with my “boyfriend” (saying it like this cause he never officially asked me to be his girlfriend) for 7 months going onto 8 we talk daily even while he’s at work but only when he’s on his breaks. He has 2 kids b5 and g10 from his ex. In the beginning he wouldn’t talk to his baby mama unless it was related to the kids. On Tuesday 02/08/2022 as we were FaceTiming cause I was working late he mentioned that his ex called him cause she hurt herself and her brother had her car (baby mama, brother and their mom all live together and only have one car) so she needed a ride to the emergency room. He dropped what he was doing to take her and then picked her back up. Things between my “bf” and I have been on the rocks lately mainly cause we don’t get a lot of alone time. And when we do is phone is being blown up from the kids or his mom.

Anyways, I don’t like the idea of him still doing things for her that aren’t related to the kids and I want to tell him that but since things have been rough between us lately I’m scared to tell him how I’m feeling. I could really use some advice right now

Forgot to add that his ex does have a boyfriend