REPOSTING WITH PARAGRAPHS! Is it possible for my boyfriend (20M) and me (20F) to repair our relationship after being together for three years?

Hello everyone! I anticipate this will be a bit of a lengthy post, so I appreciate your patience. My boyfriend and I go way back to middle school when we met and quickly became best friends. He moved a few hours away to live with his dad during our freshman year and ended up dating someone who wasn't fond of me (yet would still message me about their problems?). He came back during our sophomore year, and we reignited our friendship. At that time, I was in a pretty toxic relationship with my ex, and my boyfriend really helped me navigate my way out of that situation. We started talking in July 2021 and officially began dating in April 2022. I know it seems like a long period of "talking," but I wanted to take the time to heal before jumping into another relationship; the last thing I wanted was to drag him down with me. From July 2021 to December 2022, he was absolutely amazing—always there for me, complimenting me, and making me feel special. It was like he was putting in extra effort to win my heart over again. In January 2023, we hit a rough patch and ended up breaking up after a series of arguments. I admit that when we argue, it can get pretty intense. I have bipolar disorder, which means I often react more strongly to situations than others might. After about a month, we got back together, but we've been a bit on and off since then—we'd have months where we were great, only to slip back into conflict. I want to clarify that neither of us has cheated during our time apart, but we would meet occasionally to catch up because we missed each other. Things were going well for months, but lately, we’ve been facing friction again. Since the election, our arguments have escalated over trivial political discussions, and talking politics with him feels like talking to a brick wall. We've been bickering over various topics, including plans to hang out and him not putting in as much effort as he used to. Just the other day, I walked into his room to find him on his phone, watching YouTube with an AirPod in, barely acknowledging my presence. It seems silly, but it genuinely upset me because he hasn't been the same for a while. While he’s still a wonderful person, it feels like he no longer feels the need to put in that same effort to chase me, even though I'm still trying to show him my affection. He does thoughtful things, but I often feel like I'm not his top priority. Two days ago, I asked him if he wanted to hang out the next day, and he agreed. (We live just three minutes apart.) When I called him yesterday morning to check in, he mentioned he and his mom were going to Walmart and that I could come over afterward, but they didn't leave until around 4 PM. I only found out they had gone when I passed them on my way to town. Despite being in touch throughout the day, he spent most of it playing Xbox. When he finally got home, he called to say he was taking a nap and that I could visit him afterward before he headed out with friends. I felt discouraged because I had been looking forward to seeing him all day, and it felt like he could make firm plans with his friends but not with me. This has been a recurring issue in recent weeks—he's often had time off or said he would be free, only to get called into work unexpectedly or have to stay longer. I've expressed that it feels like he doesn't want to see me, and he insists that's not the case and that things come up. After an hour of arguing, I suggested he take his nap and we could return to the conversation later. When he came over after his nap, he shared that he wasn't sure if he wanted to continue our relationship since we couldn't seem to stop fighting and he didn't know how to resolve things anymore. I urged him that if he could just put in a little more effort, it might help me do my part as well. I recognize I’m often the one who gets upset and instigates conflicts. He’s generally laid-back and lets me express myself without getting angry (he’s a stoner, which might explain his relaxed nature). But I get frustrated about his lack of effort. We ended up talking for a while and agreed that we want to work on our relationship because we're both tired of the constant strife. He expressed concern about worsening my mental health, given that I’ve been dealing with stress from other areas of my life, and he genuinely wants to see me happy. I love my boyfriend, and I know he loves me too; we’re just both exhausted from the conflicts. This turned out to be a lengthy rant, but I thought some context would be helpful. I’m at a bit of a loss and would love to learn how to communicate better and express my feelings without causing conflict. I feel positive and determined about wanting to fix our relationship, and it’s reassuring that we both share that desire. If anyone has tips on how we can navigate this more smoothly and reduce our arguments, it would be greatly appreciated. Thank you to everyone who took the time to read this, and thanks in advance for any advice!