Why is my husband acting this way?

I and my husband has been married for 5years and we have two kids. but for the last 4 years we have been having this problem, he accusing and been so suspicious of me for God knows reason. I have never cheated on him and I have never denied him sex for one days since we got married.I am a house wife I don't go aside and he comes home when ever he wants, he comes for lunch something before lunch time he never saw me with any man since we got married but he still accuse me of cheating on him, I have told him so many times and even sworn on the sea for him but he still act the same way, he told me that his aunty cheated and his uncle and had a daughter for the man that he has saw so many women cheat on their partner, when ever he come home he will search under the bed ,look for foot prints or walk around the house, it make feel so unhappy, something when I get sad about it , he will get very mad at it, even beat me for what I didn't know about it.he will invite his friend over and live him and went away, he will pretend as if his is going to take a fresh air he will go at stay at the window to hear if I will talk to his or what ' I don't just know ,may be he is seting me up.he invited two of his friend ask one to stay while he went to buy something with other on their way coming back I heard him telling his friend that iam inside having sex with the other one. while I didn't not. we have lived in three different houses each one has each reason why he pack out, the first one was that i was bring men into the house when he go to work, while am not.second one was that our neigbhor are introducing me to men, our neigbhor are old arabic couples who live with their children and grand children I don't know why he should say such a thing to them now we are living in our third house he have started again work around the house looking for foot prints when ever he comes back from work .I don't know what to do, will he stop? He is making to feel so uncomfortable, and angry too. I love him and I care about him and I will never cheat on him, but I don't know why he is punishing me . Is like someone told him something about me that I didn't not do, or what, what should I do should i call his mother and tell her about her sons behavior or will he stop acting this way, I HAVE DONE NOTHING WRONG TO HIM.I DO ALL THE HOUSE DUTIES WASH HIS CLOTHES FOR HIM,GIVE HIM FOOD IN TIME MASSAGE HIM AND CUT HIS NAILS FOR HIM WHAT ELSE CAN I DO FOR HIM. HE MAKES ME CRY EVERY DAY