What can I do to stop a married man I'm afraid of, trying to manipulate having sex with me?

I follow this guy on social media and he follows me too. He always post funny stuff and I always like them or comment on his post but only about the funny stuff. Yesterday out of nowhere he sent me a message saying he had a dream of me dressed up flirting with him. I just laughed it off but he kept going on saying sexual jokes and I was keeping it short and tried going on my day. He then was saying we should hang out and watch a movie. The sad part he has a beautiful wife that looks awesome and cooks great food and he has 2 kids. I just can't do that even tho he's good looking I feel so terrible even tho I haven't done anything like sex. I also feel bad because im talking to a guy that I want to be with and he seems like a nice guy and I dont want to lose him for a married man. I dont know how to tell him that I dont want anything like that because this guy intimates me. Sometimes I think I want to but I say its not worth it at all. One dick is enough for me and I just feel upset because he always posts about his wife and he's trying to have sex with me hidden

What can I do to stop a married man I'm afraid of, trying to manipulate having sex with me?
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