Freshly discarded. No closure. Hurting

I broke up with xN on Saturday last week. I was dating him 1 and half years. I found out on Friday night that he actually has another gf whom he had dated 3 years. 1 and half years he cheated on her with me. Well I messages her on fb using a fake Account and found out everything. I'm 32, 3 kids. His gf is 23. He told me he is 27, turns out he's 23. If that's not shocking we matched our stories up and he has pretty much promised same things as he did with me. Matching tattoos, vacations, marriage, the whole nine yards. I called him late night in a fit of rage with no answer or replies to my texts. He went directly to her house in the morning. She told me to text him I did. I called his phone and she answered. I told her put him on. She put on speaker and first thing he said is who are you? I don't know who you are?! The bastard denied me straight up. Then me n my sister started yelling at me and he smugly proclaimed yeah she's my gf and we have an apartment together. I was devastated because of the ultimate betrayal and rejection. Like he was all for her and I was nothing of value to him :( she left her family for him. I feel hurt. Used. Rejected. I tried to obtain closure from him to no avail. He stone walled me totally. After all I did for him it was such a cruel toss. N now I'm going thru the phase of he must love her and not me. Running emotions. Why didn't he give me an explanation at least . Just need some comfort guys. I know I need help. I'm just so hurt