How to not catch feelings ? Well more than he has?

I have been seeing someone for about two months, I would say we're pretty coupley but no official title. He can be very passive aggressive about things when he's jealous, but then tries to act like he really doesn't care and there's quite a double standard for what's acceptable for him to post / do versus what I can? I haven't dated in a long time, how does this stuff work these days and what's acceptable and what isn't? Should I quit while I'm ahead ? We have great chemistry but we both have strong personalities, and I think deep down he's trying to fight his feelings