I duno if he's with me bcoz he loves me or he just needed someone to be with him? Im hurting and confused...?

I've been with this guy for more than 1 yr although we started on the wrong foot, we were able to pull it off. We now live as common law husband & wife, it was hard bcoz as we have different nationalities, our culture is not the same. I admit this is the 1st time in my life that I cared and loved a guy more than I had given in the past. I am literally more than a gf, meaning, I take care of what he will eat for breakfast and dinner before going to work, pay bills, manage the laundry, wash the dishes etc etc. I am a graduating Law student and at the moment I'm taking my last review subject so I can finally take the Bar Exam this yr. Bottom line? I just stay at home while he works graveyard shift. I can never forget when he attended their company year-end costume party in 2009. I didn't bother to ask him whatsoever when he got there, didn't even call him or txt him coz I really wanted him to enjoy. At 4am I woke up and he's not home yet, only then I called him but he didn't answer. 6am I left home to go to school but every 30mins I am calling his phone and our home number but noone answers. Lunch time, I still didnt hear from him. I didnt jump into conclusion coz I want to give him the benefit of the doubt. 5pm I went home and he was there lying snoring so nice. He felt my presence so woke up and pretended that nothing happens. I told him to say something, he said he was so drunk that he couldnt hear his phone ringing. And that they were having so much fun he totally forgot to update me. I asked permission to check his phone and there I found out that he has 2 outgoing calls to 2 girl coworkers at 3am and some txt msgs which was not sent to a certain girl coworker. Still, I didnt accuse him. But when I returned his phone in his jeans, I saw an "unused wrapped vanilla flavor condom" in his pocket. I was frozen for a moment, then I composed myself and got really pissed. All that he could tell me was he couldnt remember buying condom and he didnt know how it got there. But he swore nothing happens that night. I am 29yo and im not stupid! I told him to ask his coworkers who was with him that night about what exactly happened to him and the facts behind the condom. After what he did, he just pretended that everything was just fine with me and he totally forgot to do what I asked of him. It's been more than 2mos but nothing. This morning I forgot to signout in skype (we use this to communicate while he's at work). When he arrived home, I was playing pc game. He joined me but in the middle of the game, my decade-old friend from canada called in skype and talked to me in his presence. My guy was so pissed and complaining why i added 3 close friends in skype? He said it was suppose to be an exclusive account for him. He said I disrespected him and betrayed him for what I did. He said I need to be punished for what I did. Question is, what did I do? He started to break things, he smashed the tv and almost hit me. He said I was careless, I dont follow his house rules. Then he started to bring back past issues and started to insult me like I'm some kind of a he just picked up somewhere. He told me that I can never get an Argentine guy (him) with my cheap and creepy breakfast menu. Im so hurt that I reminded him of what he did in December but he seems not to care about it. Then I asked him, if thats how he thinks of me, then why is he still with me? He said, bcoz he needed someone to make him happy. I almost say "thanks im flattered, but sorry I'm not a clown." I dont know, my mind is empty and my heart is feeling so numb right now. I know I need a break. Then I decided to go home in the countryside with my parents just to relax and find peace of mind. I know the answer to my question is right infront of my face but I'm writing this novel to get opinions and criticisms. This is affecting my studies and for sure it will affect my review if it continues. Critics and highly opinionated people, I need to hear from you. Thank you!