Yes multiple times.. it works tho. If you really want it to work then brag about him, post pictures of you two, take pictures of his sweetest messages and post them or send them to the guy you want jealous saying "isn't he just the sweetest" or "oh why didn't he show up sooner." Or you know this person better do something that you know that will make him really jealous. Sorry if this is nonsense but I just have a lot of guys that like me and there's a few that I've had my eyes on and are in love with but I would never cheat.
That is really immature and fucked up. Don't know why anyone would ever want to do that. If they don't want you when you're single, but magically want you when you're taken.,... then you shouldn't want to date them in the first place. Stupid.
My brother's latest ex-girlfriend did that and I hated her so much for it. She knew I hated her like no other and wanted to fight but chickened out when she found out I am friends with the girls whose motives you should never question. They have been suspended multiple times for fighting. After she found that out, she avoided me. If you do this, you are a shitty person.