I found out my very good friend is dating my ex without her letting me know, what should I do?

Last month I was going through my blocked list when I randomly opened my ex's Instagram account and saw his bio which had emojis of a (cat heart a dog heart a couple). The following day I had a strange thought that a very good friend of mine with whom I shared quite a bond.. hadn't posted stories for too long (she posted them regularly). I was sus as I had seen their picture before too as well and so I checked her account to find out the same emojis in her bio (cat heart dog) and she basically hid me from her stories. I was shocked to see that. Later I was confirmed about their relationship. SHE CALLS HERSELF A GIRLS GIRL, DUDE WHERE TF IS HER GIRLINESS IN HERE? Yesterday I removed her from my Instagram but I got to know that they both are "very happy". I believe I've moved on from that ugly bastard but what hurts me is to know my friend is with him and she does not have any self respect. Plus I've been thinking of his and my memories again. Our breakup happened last year, July. And he was so quick enough to find a new "her" which is my friend. After all, he was my first ever relationship and my first love. Its just too much for me.

I found out my very good friend is dating my ex without her letting me know, what should I do?
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