Are my feelings valid?

I am not gonna proof read anything so sorry if anything doesn’t make sense and it’s super long but,

Me (F, 18) and my boyfriend (M, 18) have been dating for about to be 10 months. Ever since the beginning of our relationship, his past has gotten involved into our relationship for example, he had a “situationship” back in October 2024 that lasted around a month and it eventually ended with a bad heartbreak (from what he’s told me). He also had a thing with a girl back in November 2024 that was around two weeks and he told me he basically used her as a rebound for the girl the month before. In December 2024, a girl found him on Instagram and they texted for a little bit and then he found out she has a boyfriend and confront her and that was that. In Jan, he called up the girl from Oct because his friend was calling his ex “as a joke,” essentially doing the “new year new us” thing. We started dating in February.

Basically, my boyfriend and I met at school and the girls from Oct and Dec also went to the same school as us. When we walked in the halls, we saw the Dec girl from time to time and he would turn his head away from and laugh because he saw her and this happened all the times we saw her. He also did the same with the girl from Oct when I would walk to his car in the parking lot after class, she would be behind me since she was in my class at the time. I confronted him asking if he wasn’t over these girls but he told me he doesn’t laugh because it’s funny or because he misses them, he laughs because he feels awkward. I wasn’t too happy about it but I was somewhat reassured when he told me it wasn’t because he missed them. Everything started to get to me one night because this is my first relationship and I’ve never really been involved with guys ever because I’m a quiet girl, I broke down in front of him when we were hanging out since I used to be friends with the girl from Oct and I know how great she is and both girls are very pretty, he told me not to worry and he was sorry for making me feel like this. The next day after, we were in the car going to my house and my boyfriend looked out the window and asked me “is that (Oct girl)?” I was pretty weirded out since I had told him how I felt about this girl and I didn’t even see who was in the other car and I just stayed quiet. Eventually, these weird things ended and I finally felt at peace until, the girl from Nov (she doesn’t go to our school), called my boyfriend and had asked him to go to prom with her. My boyfriend told me that he had deleted her number and it was unknown caller so that’s the reason he answered but after this, I asked for her name and found out that they were still following each other and my boyfriend had posted me a couple times at that point, so she knew we were together. At the time, I brushed it off because I didn’t want to spend my energy on these things and my boyfriend had blocked her so I didn’t think anything of it.

Back to now, we had broken up for a week and then got back together back in Sep/Oct, and I found out late Nov that my boyfriend had unblocked the girl from Oct during the week we weren’t together and I got mad at him for it but he said I was making something out of nothing and kept bringing up the pact we made about “not bringing up the past.” We broke up again after that day, but he said he wants to try and make it work so we’re still in contact. We were no contact for about a week again, but when we had met up, he was being very secretive with his phone when he usually isn’t. I asked him what was up with that and he told me that he was back in contact with his girl friend (there was a little problem with her during our relationship but I don’t mind that they were in contact since I was also in contact with my guy friend), and he thought I would be upset if I saw before he had told me. Later, he told me he was back in contact with the girl from Nov and lied saying it was his girl friend because he knew I would get mad at him. I felt very iffy about it because he told me he still wanted to see me but was in contact with a girl he had a somewhat relationship with in the last and had disrespected me before. I told him I didn’t want him to be talking to me or seeing me if he was in contact with her but he told me that there shouldn’t be a problem and kept reassuring me that “they had made it clear they’re just friends.” We recently got into a fight about this because he keeps bringing up how I’m bringing up the past situation about the Nov girl calling my boyfriend to ask him to prom and how it was months ago and I should just forget about it and shouldn’t spend my energy being angry about it.

Am I wrong for feeling this way? Or am I being dramatic for bringing up the past?

TL;DR:

I’ve been dating my boyfriend for about 10 months, but his past situationships keep getting mixed into our relationship. From the start, he’s had awkward interactions with girls he used to talk to, and he’d laugh or act strange when we saw them at school. One of them even called him to ask him to prom while we were together. Later, he unblocked one of his past girls during a breakup, and more recently he’s been secretive with his phone and lied about being back in contact with another girl from his past because he knew it would upset me. Whenever I bring up these things, he says I’m bringing up the past and being dramatic. I feel insecure and disrespected, and I’m trying to figure out if my feelings are valid.