Hey, you are so tragic. It's okay to meet such an emotional liar. Be careful when you make friends in the future, especially online. There is still a gap between virtuality and reality on the Internet. It is impossible to get to know a person deeply through several chats, so I remind you to pay attention in the future.
Regarding revenge, you can report it to the network administrator and ask all the dating networks to block his account, so that he will not continue to harm others. In reality, you can also go to his unit to react with his leader, let his leader talk to him, give a message to his family and give him a warning.