Why did he unfollow me on Instagram?

So this Sunday I had a fight with my ex, because on Saturday night me and my bestie were out with his friends, but later that night we met two hot guys and stayed with them... And my ex texted me on fb on Sunday and said that we're stupid that we bailed on them like that for some other dudes... Of course I fought back and I was really mean. Meaner then him. It came to the point where I unfriended him (this was sunday). But today he unfollowed me on Instagram. Oh and he's with his ex again. At least the last time I checked he was, but now I don't understand this strange behavior. Please help. Xoxo
Why did he unfollow me on Instagram?
Add Opinion