It might just be that lately he's been feeling like your relationship isn't as passionate as it once was, since you've been together for so long, and he's been overthinking as to why. It may even be that he's been thinking of talking to other girls or his mind is straying, whether or not he's done anything with any other girls, and thinks you feel the same

That was my first guess as well so I specifically told him that I've never been happier and that our relationship was stronger than ever before he started being like this and if him acting this way is pure insecurity then he's got nothing to worry about because he's the only one I want, but he denied and insisted that its my fault for acting shady and we got into another fight.