Not Just Once
I was once dumped by a guy I was with online for several months and who I had known for over 2 years, he just up and disapeared from the chats and the irc network we communicated over. He also stopped answering my emails. It was a rough month being basically abandoned with no explaination, without even knowing for the first week if he was alive or dead. Turned out that between my depression, anxiety and desire to talk on the phone, he couldn't handle the stress. Ugh, pissed me off so much.
Another time, I was dumped by someone online so they could be with someone else who I also liked, the day after he split up with one of my best freinds she dumped me and got with him. It was low, it was mean and it stuck with me for months hard.
My rl record isn't much better, but it is a lot shorter