Why did he do this to me? (long)?

The backstory: We were introduced by my cousin, the nite we met he was a great guy. Yes, we slept together that night. We had a great relationship, then he turned nasty. He has been calling me nasty names like c*nt, sl*t, an "ok f*ck" & so I txt back telling him off. Last nite, I find out he had been with me, his wife & his high school sweetheart. I was out with a friend of mine who turned out to be his enemy. So he txts me, "Have fun with the loser" and he has been telling how his girlfriend is hotter than me and a better f*ck. Low blow much. He has been fighting with me since and finally stopped so he says. Expect I know he will be back. The girlfriend uses him for money, she put him into debt. His wife does not work & stays home with his son. When he needed help, I got the call, he calls me everyday and txts me. I dont call, but I txt him sometimes, like thanx for this or that. Well when he saw me with his enemy, my friend, my friend tells me he was mean mugging me so was his girl. Why does he feel the need to put me down? I talk sh*t to him back, but if I was not that good and I was so bad, why did he call me every day? why? I know he will be back, begging for forgiveness because not to be concieted, I am hot, I am educated, I have a great job, I love to joke, & I dont place him on a high horse like everyone else. He is an undefeated fighter, a belt holder, local celeb...I just wanna know if he hates me that much to rub it in my face about his girlfriend, he wont even say anything about his wife.