Need advice 😔

Sorry this might be long. 
In every relationship I've been in, I start getting bored around 5 or 6 months into it and we break up. I've been dating my current boyfriend for almost 7 months now and I'm not feeling bored...I actually love him a lot. But for some reason I feel like I need to break up with him. He's the nicest boy I've ever met and I know I'll never have anyone better but..I dunno. Something just feels off. And we talked about it. He got me feeling better, but now I'm right back in this weird slump. Ugh this sucks and I don't know what to do 😫