My married ex keeps pursuing me

UPDATE 2: he told me he's going away to take a break and think about things. I told him no contact with me during that time
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UPDATE: he never cheated on me, we decided to break up on our 5 year anniversary and we got tattoos together that same day.  We wanted to experience life on our own and we made a promise we would get back together in5 years. He married her in part to stay in the country he was on visa............................
My ex won't let me move on. He was my first love we dated for 5 years. We still love each other: but he got a woman pregnant and married her. I was devastated but I accepted it.
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I don't contact him. He contacts me occasionally telling me he saw or did something that reminded him of me. I don't respond, or when I do I'm short and bitchy in my responses like "cool story brah"
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Today I've been crying all day because he has been texting me all day saying that his relationship isn't going to last and he always believed I was the one from the first time he saw me and how he will always love me. I knew we both felt that way but we didn't say it....
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I don't want anything to do with a married man. I would never hook up with a married man. 
It's very hard because I never stopped loving him. He keeps trying to see me but I decline. He tells me he's never felt love like he did when we were together. How he's never had sex like we used to make love. 
How he still years later, always thinks about me. 
It's unfair to his wife and to me. I told him I will not mess with a married man. 
He says he's going to do some soul searching and figure out what he's going to do.
He's afraid I won't stay single for long...he's right I probably won't. And he's afraid of losing the chance to be with me. 
Of course he also feels like an asshole for feeling this way towards his wife. He doesn't know if he should stay with her for the kid.
I know this is some Jerry springer type drama but your advice would mean a lot to me.
 I'm hurting right now. I have loved this guy for 10 years. He's loved me for 10 years. He got married last summer, they had the baby first.