Should I(19F) tell my boyfriend(20M) that his relationship with his ex sexual partner makes me uncomfortable?

My boyfriend(20M) works on producing music. It's more of a hobby at the moment but he's hoping to get his music out there and help other people record.
When he was in college, he met a girl in a class who was interested in recording with him. He thought it was great since he wanted more people to record and she wanted to have her music produced. Well they became close friends and eventually hooked up. While my boyfriend says it was a one time thing, the information of the whole thing kept changing. I would believe it's because he has the worst memory and probably just forgot some details. Yes, he's told me what went down, and I really appreciate that because were still young and it's nice to know how many people your partner has been with (even though it's just two for both of us^-).
I know that this relationship is no harm, but it just makes me feel so uncomfortable. When I(19F) was away for college, he would go and pick her up to take her to his house (which has a recording studio) and I wouldn't even know until she was there. I just remember one day I was walking back to my apartment and I wanted to call him (we were in a long distance relationship for my first year of college but corona allowed us to live together until my school opens back up) but he said he was on his way to pick up, let's call her L. I was honestly heartbroken that he didn't tell me he was going to be with L that day. Like so heartbroken that I started crying. She eventually moved back to her home town since she was really homesick, and I thought that was the last of her. Months passed, I moved back to my home town with him, and everything was great. He mentioned that L wanted to call to catch up, no big deal. I guess their call made L realize that she wanted to continue recording and working with my boyfriend. I also had no worries about that. Something that bothered me about the whole situation was that my boyfriend was doing this for free while he would charge literally any other person. It takes up HOURS of his days to edit music and it angers me that she is taking advantage of him like that. They text a bit and I don't even go through his phone to know that. We will be watching a video on his phone and he will get a notification from L and swipe it away. It hurts, but the more I write about this the more I realize how crazy I sound.
I know that he wouldn't ever do anything to hurt me and he is the most honest person I have ever met. I love him like crazy and I don't want to mess anything up with his future recording.
Should I even talk about it?
TL;DR : My boyfriend still talks with his ex sexual partner and I was wondering if it's a bad idea to talk about it.
EDIT: I want to clear up that they don't text ALL day, it just seems like that since he'll get a notification from her when we are watching something on his phone or whatever. L doesn't live in our city anymore, and both my boyfriend and I live together and work from home. Thank you all for the advice.


Source.