I need your opinions everyone!

So I started seeing/hooking up (not sex, but foreplay only) this guy who is about 8-9 years older than me (I am legal of age, don’t bash) on July. We were doing pretty good, he was cool, I needed some sort of thing to get over the guy I used to hooked up with (and eventually developed feelings for him). We kept on planning to come over his house and have sex for the past few weeks, but end up not happening because of some life situations. We both do see other peope too, but for me, I only hook up with them once and never ever see them again because I feel like having multiple partners is just....a lil odd for me, if I have to put it that way. But I guess he was constantly seeing about two-three people including me at the same time and I just wasn’t aware about that- I knew he was seeing other people too but not that he is actually DATING someone but they’re in an open relationship. I found out about that this morning and I was, let’s say, a little upset and mad. I talked to him on snap, asked him to stop hooking up with me because I just don’t feel good about it.

I sounded like a hypocrite because I did see other people too. But I have something in my gut that says I should stop seeing him. It was the same feeling I got when the guy I used to hooked up with asked me to have a threesome with some girl he just met on the internet. But then I brushed that off and continued hooking up with him.. which was a big mistake because I developed a massive feelings for him.. I had to deal with it for about two months.

Am I right to do this? That I cut him off because I’m trying to avoid catching feelings?