well bad news sweetie. he already got what he wanted from you. so now that you gave him some ass (which was exactly what he wanted), he has just simply bailed out of your life and doesn't want nothing more from you
so I seriously don't understand why you want to fight for someone who used you for sex then disappears from your life. and you texting him nonstop like a sucker, yet he keeps dodging you
From the sounds of it, he was after the sex. Yes there are worthless f***ers out there that will do that, and give guys a bad rep. But I'd say move on from him. You'll find someone much better than him.