Someone said :
Grindr is just the new chatroom. Back in the day when chatrooms were popular I used them to chat. Not to have cybersex or to hook up or to swap pics. Just to chat.
I'm in a relationship and use Grindr to chat. Granted, most people are looking just for sex but there are loads that just want to pass a few minutes on a bus and have a chat.
I have my relationship status pretty clearly stated in my profile and I say that I'm just looking for chat but the most annoying thing is when someone ignores it or assumes they can convince you to cheat on your partner. One time, this guy popped up and offered a BJ. I said that I was in a happy, healthy long term relationship. He replied 'So am I. But do you want a BJ?' I told him to fuck right off and blocked him.
Different guys have different standards and different ideas about what's OK when in a relationship. For all you know, maybe his partner 'allows' him to have a bit on the side. And he wasn't to know what configuration your relationship has. Some guys, especially gay guys (IMO) seem to think a bit on the side is perfectly acceptable - as in it doesn't constitute cheating - and some couples even agree on this. It wouldn't be my cup of tea either, but just saying people have different relationships.
Also, in the back of some guys' minds, they don't *really* believe that guys are on Grindr truly for just a chat!