No harm in going out with a friend. But that’s what happened with few previous relationship you had. Plus you plan on having sex. If he truly a friend he’d refrain from sex with a vulnerable woman in a process of divorce. And I wonder about why friends would have sex? It sounds like all these men you consider friends are after other things (like the other inappropriate guy). Now this guy? How are they friends? I wonder about definition of friendship here

You broke up with someone and went out with a new man to help you forget the previous one. But then simple going out for drinks ended up in a disastrous relationship every time. If you really do want to meet the guy, don’t drink, it leads to messy things and questionable decisions. Go for breakfast or coffee or lunch or walk in a park.

It might be better just going out with friends and no romance/intimacy involved. I and others had a bad feeling when you went out with your husband the first time (he said all the “right” things on a date)and you were grieving two previous relationships. And you also said you are only going to have fun, but that’s not what happened

I again have a bad feeling about outing with this guy. You are vulnerable and wrong people sense it (like that guy you let to rub your legs).

Try to find some girlfriends or acquittances to go socialize instead if possible.