Relationship difficulty

I have been with my boyfriend for 5 1/2 years now. Our relationship is great, he's my bestfriend and I love him with my whole heart. I know he loves me too, he just sometimes has an odd way of showing it. I just feel like every time we fight, he gives up on me and I am the one doing everything to save our relationship because i love and care for him so much it hurts. But when we are together and doing fine he's amazing. He does everything he can to look out for me and helps me in anyway he can. He's always putting me first and making sure I'm getting the best out of life and being the best person I can be along with showing me how much he loves me. He's not a huge one to say "I love you". He says it occasionally, but he mostly shows me he does in every little way he can. We just had a fight last night and he said he wanted to break up. He's accusing me of hiding something from him- he never said what it was. He always has a difficult time trusting me, which I think came from him being cheated on by his last girlfriend which is very understandable as I was cheated on as well. So I get it. I have a hard time trusting him as well, but we continue to work on that. However, this he just won't let go of. I'm not hiding anything from him and I am 110% sure of that. All I do is go to work and stay at home when I'm not working (unless I'm with my family). He doesn't like if I talk to other guys or have guy friends which is completely fine with me so I don't do any of that. I mind my own business, he's all I want and am interested in. I want to marry him and start a family soon since I'm finished with college and have a good job but I don't think he understands how serious I am about that. He just has it stuck in his head that I am messing around with him or have in the past. He really has nothing to worry about but I'm having a really hard time getting that through his mind and I'm very afraid that I'm losing him. I know many people say if he's accusing you of hiding things/cheating then that's because he's cheating and trying to deflect the attention from him. But, I really don't think he's cheating on me. He's a very honest person even when it comes to things I don't want to hear and that's one of the many things I love about him. How do I convince him I have nothing to hide and I'm good to him and always have been?

He sounds like he is suffering from paranoia does he smoke weed? I think he needs counseling for what happened this will destroy the relationship and it will exhaust you, the answers lie within in him.

He has in the past, quit for a while, and now is doing it more frequently again. So maybe you have a point? I did mention counseling but he thinks it won't help us, he just insists I'm lying and says that someone told him something, which I really don't think is true because there isn't anything for anyone to say about me.

Hes mostly likely scared that you are going to do to him what his ex done. Best thing to do is continue reassuring him how you feel and what you want. Insecurities in a relationship makes things 10 times harder but if you both put these issues aside and be happy together everything will fall into place. Good luck