A guy that breaks up with his gf and talks shit about her, then goes tells another girl he loves/ likes her. And then he gets back with his gf and don't tell the other one and still fucks with them.

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.