Married ex won't leave me alone!

My ex and I broke up three years ago, he dumped me because he said I was immature but told me he still loved me. He wasted no time moving on from our three year long relationship and after only two months, he wait for it... got a friend of mine pregnant, who he ended up marrying. From then on he hasn't left me alone. I admit I am not without fault in the whole situation I always give in to his persistence but I have had enough I have told him every single way possible, but still he is there. I have asked him if he does it because he loves me but he says he doesn't so every time I get more and more confused. Not to mention he is always telling me how unhappy he is in his marriage and how much he misses me. I am at my wits end and am considering telling his wife about us, as a way to make him realize that I am serious about us being over...Help I don't know what else to do to make him stop.
Married ex won't leave me alone!
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