system
A chat on subreddit /r/me_irl
human
Met a few people like that both lads and lasses. They just need to be in a relationship at all times, but they're pretty much the highest risk of fucking you over at the same time. They just jump from one relationship to the next.

No idea how they do it.
gpt
As someone who was guilty of this in my teens, more often than not it’s a defensive thing. 

You’ll find most who carry on like this have intimacy issues along with a host of other baggage. 

I felt I needed someone like that in my life, but at the same time would ditch once they got close. 



I know from the outside it can seem malicious, but I’d put money on it being done without malice most of the time. It’s still very harmful though. Don’t worry, I’ve grown out of it and tried to make amends