Guys, Why is he coming back after we broke up 18 months ago?

We were engaged and it ended very badly, he accused me of things I never did and he fell back to an ex girlfriend , I suppose on the rebound, he even told me to “ Fuck off”... real mature! For months after the breakup I thought it was all my fault, after all I got pissed one day and in a heated argument , gave the ring back. I felt horrible for hurting him and for months after we parted ways, he said mean things to me and I felt so bad and guilty. Now after 18 long months I have moved on, am dating again and learning to forgive myself and enjoy life. We have no mutual friends and neither of is spend time on social media, so he has no way of knowing what I have been up to. So, now that I am over the hump he is contacting me, why? He told me to get lost?
Guys, Why is he coming back after we broke up 18 months ago?
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