Why is my ex trying to get a reaction out of me?

My ex lost feelings for me and dumped me to date another chick. It's been 8 months since they've been together. They have been traveling, going on dates, close to getting engaged and im sure they are going to pop out with a baby soon. My ex told me to stop contacting him permanently to respect his relationship and his girlfriend. I blocked him. About four months later after he told me this.. I suddenly received 15 calls from an unknown number. I answered on the 7th call and heard nothing so I hung up. I answered on the 8th call and heard a bunch of farting noises. I answered on the 9th call and heard sex noises. After that I put my phone on silence. The next day I found out it was my ex who was behind it and said he was only calling to check up on me. The next month he does it again but I don't answer none of the calls. Four months after this, he made a textapp number and texted me sexual things. He asked what was I doing and how he wanted me to come over for sex. I can tell it was him because of the way he type.

Why is my ex trying to get a reaction out of me?
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