Understanding men!!!

Breif rundown.... i met this guy about a year ago. At first we hit it off super well. We had so mucb chemistry. Kisses where perfection. Tmi but sex was perfection. We had such a laugh together. Alot in common. Down fall. 6 months in after getting serious he came out that he had a gf...... and 3 kids. He apologised enough and said he really liked me and had developed so many feelings for me. He even told me he had planned to leave his gf as he wasnt in love with her. He said he stayed for his kids .... that he and her had nothing in common and never spend time together. Only with the kids. That she is a nice girl and that but he just dosnt love her. He made alot of promises to me. Future talking alot about us living together etc. But once things got heavy for me and i started to ask questions. On his motives in our relationship etc. He was gone. He backed off so much. No more texts loads. No more phone calls. Only when he wanted to meet up. He wasnt as intentive anymore the time we spent together. And over time it wore away more and more. When we did meet up he said it wasnt personal to me its just he cant leave his children

And dosnt want to keep messing with my head in the process.that im still such a wonderful women and his feelings havent changed toward me. Then after one night together again boom. He was gone. Nothing at all since then. And even on that last day together he was such a dick. As i was getting ready for work i left a blotch of make up on my face. He stood smirking at me in the kitchen. I didnt know why. When i noticed later in the mirror and text him thanks for telling me id make up on my face lol. He was just like didnt even notice hahahahahahhaha away here to do some work. Then a thumbs up emoticon. And thats been the last i ever heard from him again. What is that about :/ is it me. Is there somethint wrong with me :-(