Bite my head off if you wish, I just find the following scenario strange!
Woman I kind of know (not very well) messaged a man (her now fiance) to ask if she could be in his music video. They did not know each other at all, was completely random.
He told her (knowing he was unable to get the amount of girls he wanted in his music video) "yeah sure I'll chuck them out for you to be my vid"
Few weeks passed. She messaged him again. He told her that he was all hers, all the girls were gone. 
They agreed to meet. (They live 3hr train journey apart)
Meant to be a one night kind of thing.
She introduced her kids to him ect rater quickly. She often stays at his with her kids for long amount of time. He openly says he only wanted a one night stand with her but now apparently they are soulmates!
I find it bizarre.
However, I have nothing against meeting someone you talk to online, just me personally I wouldn't do that.