Apps like Grindr and Scruff are hook up sex apps. They are not friend apps even if you have met someone on there just for that. That was likely a very rare case. In my research I found that 99% of the people on there hit me up for SEX only. Often times the first words they say to me are horny? Or I would get a pic of their ass or cock. They wanted to meet and get busy right away. This is where the lonely or the time wasters go to. If you’re on there for just sex then you’re in the right place.
One day you accidentally see one of those apps on the phone of the person you’ve been dating or involved with in a relationship. How would that make you feel? Would you care or would that bother you? If it doesn’t bother you, then I would imagine you’re likely involved with someone that you don’t think that highly of.