I am jealous about a coworker`s friendship. What should I do?

I have a love/hate relationship with a co-worker. We kinda disliked each other in the beginning, and after months of a rollercoaster-like relationship with many highs and lows, we ended up being friends.

Then, a new guy joins the company and my coworker immediatly strikes a friendship with him, much faster and stronger than with me. By coincidence or on purpose, I don`t know, he don`t like me and shurgged off my friendship attempts.

The situation is causing me a bit of sadness, so I decided to create distance of my coworker, to avoid feeling bad. Problem is: my coworker sometimes misses me and make attempts to restart communication, which are kinda awkward for me.

Maybe I am too possesive, but I don`t like the idea of playing second fiddle. Now I don`t really know how I should deal with this situation, besides keep trying to keep my distance.

I am jealous about a coworker`s friendship. What should I do?
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