Should I stay with my boyfriend after “cheating” on me?

Should I stay with my boyfriend? We are in highschool, and we’ve been dating for ten months and it’s been pretty good but he is an idiot quite literally and metaphorically. He is an angel now but in the beginning of the relationship it was rough but i decided to stay with him. He always threw these childish tantrums, and other stuff but the thing that really got me is when he like sat in the lap of this girl he used to like and then the girl he also used to like (and his first kiss, lets call her Egg) went on top of him. He really doesn’t have bad intentions I don’t think because when she got on him he pushed her off or something. This also happened some other times but he forgot to tell me like WHEN it happened and told me later on but never specified the girl. This girl like slapped his ass one time and when he was laying down she tried to sit on him and he pushed her off. I became concerned with Egg. Because he was touchy with her and would like “play fight” with her and punch her. When i told him about it he explained that she was his best friend and she was always there for him and he was like getting mad at me because he was saying that I made him feel bad for not allowing him to have friends. When I asked who she was (i found out that she was his first kiss later on from a friend but not immediately) he denied it and was texting her about it on call, which pissed me off. Typing this out is making me feel like an idiot because of how stupid i sound for staying with him. As soon as I found out I broke up with him and stuff but eventually went back to him because I thought he could change and he did for a little and didn’t do anything again until a month ago. He was talking to this girl not really flirtatiously but like a little too friendly, and he never told me until I checked his phone and he was saying stuff like “aww you’re so sweet” and like laughing at stuff (shes gay and has a gf so this wasnt on her and he knew that) so i dont know if they were just friends, but when I confronted him about it he said he was scared to tell me because of my reaction. (He called her his bestie by the way, when i read his messages with one of his buddies) I don’t think I’m a very overbearing or crazy girlfriend, just paranoid about his female friends because the ones he sat/was sat on him were you know, the ones he liked. In the beginning of our relationship he also said he was friends with some exes but I didn’t say anything to avoid looking insecure even though I’ve been cheated on in most of my relationships. He was no longer friends with them when I told him about it. When I asked about the girl and found out that it was his first kiss and stuff I literally lost it and broke up with him but he has been apologizing and telling me he changed which I think he did, and he’s not friends with anyone I ever told him about. I know he loves me a lot and maybe he didn’t do things with bad intentions because he is an idiot but also because of the way he was raised he was very lonely and didn’t really have friends and stuff. He is very clingy towards me and tells me how in love he is with me and how obsessed he is. He says I’m beautiful and says very sweet things. He does everything for me every small little thing and he tries to service me a lot and treat me good and love me and I wanna get back with him but I don’t know if I should, or if I could move on from this because why did he continue being friends with her even after that and continue hiding people from me? How do I move on from that if i do decide to get back with him? I don’t know whether to just move on from him or try again.