First, from your post I can't assume from your "he keep abusing me" statement that what he is doing is abuse. I won't make any judgements here because that's just too little information. How is he abusive, what is he doing that's abusive, etc?

You're together much of the time and you say lately all you do is fight? On that I wonder if maybe you need to take time away from each other as you might both be feeling the need for some space. Even people that love each other immensely will need space at times.

"whenever ... I think he is cheating... " ok so here is where my biggest question arises from. Why would you think that? Is there any evidence of him cheating? In my experience, someone that is cheating would be spending less time with their loved one not as much as 20 hours a day. That right there makes it relatively difficult for him to spend time with other women, let alone cheat on you. Unless you're on a different time scale than me, a day has 24 hours which leaves him only 4 hours a day to even get out and find a woman, be with her and even have a date/sex etc... Does not seem reasonable to me for you to have this fear.

"... I start shouting..." I'm curious as to whether, based on the unreasonable fear above that the shouting is driving him away. You're yelling at him based on fear that he's cheating and as I pointed out, if your time reference is correct, it's nearly impossible for that to be occurring, and highly improbably that it is. So based on that, it would mean he might be quite perturbed by the fact that you're railing at him about this and he's there going "wtf? I'm here 20 or so hours a day... how can you even imagine this?"

TBH, you seem to have an issue with paranoia and with insecurities, possibly you're a possessive of your man.

Again this is all from your brief description so perhaps your elaborating on what's going on might change what I've surmised from teh situation.