Relationship advice pls

Hi everyone. Been with my boyfriend for nearly a year and these past 2 weeks hes just been so cold towards me. I have tried talking to him but he denies it. Hes always accusing me of cheating for literally no reason, hes such a paranoid person and i have never given him a reason for him to even think that i am cheating. He goes through my phons, hes been so rude to me. Every day he starts unnecessary rows. We will be having a good day and he’ll go and ruin the day in the evening by starting on me. Doesnt tell me he loves me anymore, attitude towards me is just so cold. I pull him up on it and he just always blames me when i genuinely havent done anything. When i tell him how it makes me feel which is sad, depressed, useless and not good enough he doesnt say much, he just brushes it under the carpet or just says “okay” … tired of feeling like this