<human>: I just got out of a toxic relationship and really want to be single for awhile. But I've entered into a strange situation with an ex-coworker.  A couple of weeks after my breakup he made a move on me after some work drinks situation, and I ended up making out with him. However, I told him that I wasn't looking for a relationship and that I wouldn't be ready to do that for some time. He understood, and said I should date other people. So I felt okay about continuing to hang out with him and make out with him. I even told him when I went on a date with someone else.

But since then we've had sex and I feel like that's changed the intensity of the situation. Because we've known each other for several years, this isn't just some 3 weeks long level of intimacy. And we hang out several times a week. 

So now I have a date coming up with another person, and I feel slightly weird about it. I don't like to sleep with multiple people at once, so that's out of the question. But I really don't want to end up in another relationship so quickly! What is the etiquette for dating multiples? I've never done this before and it feels like a weird gray area. Is it cool to make out with other people? He said he's cool with it (before we slept together) but he might really be hurt by it. I just don't want to have a talk about expectations so soon... especially since mine are that I want to continue building intimacy without building a commitment yet, but that doesn't mean I'd rule it out in the future.

Also, what's the etiquette for the people I go on dates with? At what date do you mention that you have a regular FWB? Is that even relevant? It just feels kind of shady to not mention it, but it feels like TMI to tell everyone all these things. HELP.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Never done casual relationships before. How to handle the weird gray area zone between FWB and relationship potential, without freaking the other person out who isn't just a FWB but an actual friend?