Should I stop talking to this guy coworker?

there is this guy he is in a serious relationship and been with his girl for few years but I’ve noticed lately he been too nice I guess you can say like extra friendly he will stop by say hi and have a small conversation anything random like yesterday he stopped by and asked how I am I was like okay he was like well I’m tired I was like oh why he was like we went to pumpkin patch yesterday I was like ohh okay I mean I try to be as distant as I can be from him but he still be very nice and maybe he just nice dude bc he is quite friendly to others too so I don't know

Should I stop talking to this guy coworker?
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