At the end of my teather with my relationship :( ?

I'm 21 and my bf is 23 we've been together since january and already living together at my parents. We argue weekly (in which he ALWAYS leaves for a night or 2)! I really didn't want to be with him as a couple originally, as I'd been hurt before and preferred something casual, but he insisted and continued to woo me until I couldn't deny how I felt. After a few months we've had loads of issues with my friends not taking to him much and consequently I barely speak to them now. Also he text a girl a bit of an inappropriate text, which to this day he insists was 'nothing'. There has been a an issue of broken trust on my part, I had a cannabis addiction that caused problems and the odd white lie but I've completely scrapped that now to make our relationship work. But still I don't feel secure. Sometimes he's just off with me and I worry if we're ok. Recently his relationship fb status has been hidden and I confronted him last night whilst drunk. I said some harsh things like 'get out' etc but he just keeps saying I need to apologise and he doesn't know how it happened! I can't see how it would just 'disappear and I feel like he may be just lying. I don't know what to do. I am mad about him now and feel like we have something potentially amazing at times ut I just wish I could trust and be secure. Help! Thanks B x