I'm so sorry you are hurting right now. Facebook can be painful. I've had to unfriend my sister and my own daughter. They are untreated bipolar/alcoholic and they tend to put the most hateful posts on my page that would have me crying for weeks. I was unfriended by many people after the election. It hurt ... a lot.

As for your friends unfriending you. I am in no way implying that it was something you did that was bad. I think asking them why would be good for your self esteem. But be warned. they may not answer, or the answer could be painful. But whatever they say, it doesn't make it your truth. Sometimes people grow apart. Who knows why. Please don't dump a load on yourself for this.