There's something called attractions of deprivation. A ken page is a really good doctor who talks about this, and it explains how we are drawn to people who can wound us in a very familiar way. And especially if you didn't have a healthy model of what love looks like growing up, your sense of familiar familiarity could be chaos or unavailability. I know i've met the one 27 times a but If you have a history of dating and choosing people that aren't healthy for you, that aren’t the right fit, this could be a sign they're not going to work out. You end up thinking you found the one, and that it just ends up in an explosion