Why would a man do this?

[Anonymous]

Send you social media photos of himself kissing, dating or sleeping with other women? Is he trying to make you jealous?

[quaranta]

Yeah, it's either to make you jealous for a revenge, or to spark your interest in him, showing off what you are losing by not going with him, because more women = higher status, in his head.
Both cases are bad, I think you should ignore that for the best, this doesn't sound remotely a healthy person, especially if it's one around your age and not just a silly teenager being petty and provocative in the peak of their social affirmation.

[kareka]

Yes sure
Or try to turn u on
At all he wanna sex with u

[Guy13]

That’s F-up. Get away. Who cares why. Block him.