Why is my ex-husband acting so petty?

My ex-husband divorced me in summer of 2018. I had accused him of sleeping with his co-worker, and he denied it relentlessly and called me crazy. He eventually divorced me, and, to my surprise, remarried her 2 months later.

Months later, I came to get to know another co-worker who was known for being a kind gentleman. My ex, who knew this about him, did everything he could to try to deter him from forming a relationship with me- he would call me crazy, etc. This co-worker ignored him completely and we began dating. The day we began dating, as if my ex was a stalker, my ex tried to “warn” him once more, and my boyfriend ignored him.

We have currently been dating to this day and we are known as the office couple, for being happy and having a healthy, successful relationship.

For the past couple of years, despite divorcing me, my ex has been acting like a teenager- constantly trying to make me jealous and trying to break up my relationship with my boyfriend. Every time I walk into work with my boyfriend, even in a crowded hallway, his eyes are on us from the opposite end of the hallway. I don’t understand why he does this or why he doesn’t leave me alone, it makes me uncomfortable. In meetings, he doesn’t take his eyes off me (he thinks I am unable to see, but he only takes his eyes off of me if his coworker interrupts him, and then his eyes are right back on me). Recently I dropped a stack of papers and he rudely laughed at me and refused to help me pick them up.

He also rudely greets my boyfriend and refuses to acknowledge me when I walk past with my boyfriend, but smirks at me in a condescending way. He and his wife continue to show affection in front of me and laugh at me together, like children, to attempt to make me jealous. He also brags about taking his wife to a romantic restaurant and gives me a smug smirk.

Why is he doing this?
Why is my ex-husband acting so petty?
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