If a man is interested he'd communicate steadily and in substance, not superficial, and he'd ask to see you fairly soon. No, he isn't interested.

No I don't think he just wants sex either. Guys who want just sex they ask to meet right away because they don't care to get to know you on a deep level and they just want to get into your pants. But they don't drag it on and off for a month. There is no point in it

As about casual sex, nothing wrong with that if that's what both peoples want. But it could be dangerous with strangers. You dont know him and meeting him for sex could end bad. Your safety should come first