I sometimes (every few weeks) meet a male colleague who lives quite near me for a walk at lunchtime during the week. We wfh so it’s nice to get out for adult company as both alone at home all day. He has gf, I am single. We have a matey relationship, laughs, jibes etc. I feel he is getting quite flirtatious over texts but I don’t respond to anything “flirty”. Went walk a few days ago and was out with him for a couple of hours as weather was great and no rush to go back to work. We were lying in the park and he was touching my leg (not inappropriately but in a jokey way when he was making light fun of me) then he touched my boob! Just brushed it, not a grab or anything, I was a bit taken aback and he said you’ve got grass on your top! I just laughed it off and said don’t you touch that haha and we carried on. Then later we stood up to walk back home and he rubbed my back down (supposedly covered in grass). I don’t know what to make of it… I didn’t feel uncomfortable as such but I also thought hmm is he crossing a line. Should I stop meeting him?