Help me out ladies// advice

Y’all, I need some advice. My relationship with my boyfriend for the past year or so has been kinda sucky and I don’t really know what to do. We’ve had sex maybe twice and when I say that we forced ourselves to do it (or at least I forced myself) I’m not kidding. We haven’t had sex for like at least 6 months and honestly I couldn’t care less. Anytime I think about having intercourse with him I kinda get turned off and I don’t know why. But honestly I don’t see myself having sex with anyone.... We used to have a really strong amazing relationship; we got along so well and we had a lot in common but now it’s like theres nothing there, and this is all only how I feel because he says that he doesn’t see much of a change besides the fact that I have become very stressed and so I don’t want to do anything anymore. And I agree with that but like how am I supposed to fix that? Life is stressful, ya know? We’ve had so many arguments in the past year it’s ridiculous and every time we argue I can’t help but think that all this arguing is pointless and maybe it’s just time to move on. I used to see a future with him but now I honestly don’t see a future at all. I’m just kind of done, you know? I hang out with him a lot but most of the time that I do I end up passing out or I’ll do what I normally do when I’m alone. He constantly tells me that he loves me and I hesitate to say back but I usually do but the thing is that I’m not sure if I mean it.... I don’t know what to do anymore, I don’t want to leave him because I think about how our relationship was at first and how it was so great for about a year and a half (we’ve been dating for almost 3 years) and I think about that guy and that girl and it just breaks my heart because it seems like that guy and that girl are dead and they aren’t coming back. We’ve talked about this before and he’s told me “we can go back to there if we both tried and really wanted to, it won’t be the same but we can” but I just think that too much has happened now and it won’t ever be the same again... I dont know I’m just confused and sad.

And I’m sorry about this long thing, thank you for reading it if you did