There's a big conflict, and I'm unsure how to handle it.

I (17F) recently had a major fight with my boyfriend (17M) of one year, and it was pretty intense—definitely the most serious argument we've ever had. At one point, I even accused him of cheating because he's been spending time with a classmate I don’t particularly like. I can't quite put my finger on why she makes me feel jealous, but whenever I hear about their interactions, I lose it. I've never experienced jealousy like this before and I know I need to address it. Our argument lasted the entire weekend, from Friday to Sunday. He mentioned that he didn’t want to talk, and I respected his space, but as an overthinker, I couldn’t shake off the worry that he might want to end things. Eventually, I reached out to tell him I love him and I was sorry because I wasn’t sleeping anyway. He left my message unread in the morning, which only heightened my anxiety, so I messaged him again asking for a response. We finally had a conversation where I apologized, and it seemed like he forgave me. However, the atmosphere between us still feels tense and everything seems different now. This is my first relationship, and I'm worried things won’t go back to how they used to be. Is this a normal part of relationships? Are we going to be okay? I feel like crying and I’m not sure how to handle this. I don’t have much experience with relationships, and this situation just feels off to me.