Anything to do with romance seems to turn out wrong.

Nope. I have terrible romances and relationships. I'm a "can't do it, teach it" when it comes to romance. I know what it's supposed to be about, what a healthy relationship is supposed to look like but I get drawn in to toxic ones every time. I'd like to think it's me that causes it because it'd give me a measure of control but the guys all have their other relationships completely toxic... And I mean they have charges not hearsay. So I don't create the toxicity I pick toxic people and then create the toxic relationship with them. I often wonder what I would be like with a guy who has non-toxic past relationships and I wonder would I make the toxicity on my own but I'm too frightened to find out incase I disrupt an "okay" person by being toxic. Really I should try it at least once because I might not and if I did create toxicity I could end the relationship. I get into relationships I then want/need to run away from. I think recreating my childhood of running away.

So if you have a pattern maybe try to work out where it comes from and tackle it from there.

Relationships based purely on sex never last

If a person is getting into a "relationship" based on being a lover, yep. Specially if they are already committed to someone.

A lot of guys are. Maybe Try differently?

Tell him to come hang out after he