Why is my ex acting so possessive and jealous over me?

Anonymous
My ex and I broke up in January due to him not being able to get over the fact that his brother and I hooked up while he and I were broken up for a while (which is totally understandable that he’s not able to move past it).

However, it’s resulted in extremely jealous and possessive behaviour behind the scenes that he doesn’t realize I know about.

My ex’s brother and I communicate — over text and Facebook only. We have a similar friend group, but he has a girlfriend now and they’re pretty serious. He and I have never crossed a line since that one time and he knows I still have feelings for his brother. Our relationship is strictly platonic.

My ex has been acting pretty crazy lately. His brother told me that he’s been trying to “catch him” hanging out with me, even going so far as to say that I messaged him saying we were spending the night together, which of course, was not true, and resulted in the brother’s girlfriend getting upset because of my ex’s lie.

My ex has also been telling his brother that I’ve been asking to hangout with him and even talked about the trip he and I had planned for back in January.

I’m not sure what my ex is trying to accomplish here, but he’s kind of painting me in a bad light, and it kind of seems like he’s trying to insinuate to his brother that I’m off-limits, without actually saying that (they’re not very close).

I feel like my ex is a little delusional and actually thinks his brother and I have a secret relationship or some sort, even though we definitely do not.

Why is my ex acting this way?
Why is my ex acting so possessive and jealous over me?
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