Why does my ex act smug and does things to intentionally try to make me jealous?

Anonymous
Ok, so we've been apart for almost 4 months now and the break up was bad! He obviously initiated the break up with me and I resisted. I've been through this on and off thing with him and I am just tired of it. So about 6 wks into the breakup and me doing no contact, he comes and asks if I want to be his friend and I told him no.

Every since then he has been acting smug and tries to make me jealous. I have to see him at least once a wk. because we have a child together. A few wks back he tried to make small talk with me and I answered his questions but let him be.

Today after the exchange he parked his car next to mine so I could see that someone he is either dating or talking to put the letters Happy Birthday on his stairing wheel. When I went to get my son he was looking at me smugly and waiting for me to ask him about this. Why would a guy do this?

He has also done the tactic that when we exchange our son he will intentionally be on the phone and then looking at me with a smile on his face.
Why does my ex act smug and does things to intentionally try to make me jealous?
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