I understand it.
It’s hard to know who is a true friend and who isn’t. As much as you have gone deep down in this relation. Ignoring someone is harsh and mean however it’s something that is easier to do for some people, online.

I was thinking. Each case is different. There are other options for someone else goes distance. Maybe, you did something that bothered the other person or (s)he did something that in his/her mind could have bothered you and this person doesn’t dare to talk. Each person is a whole world. People can get bothered by the most insignificant things and you went all eyebrows up without a clue as to what happened.