Gay America can be a lonely place. GPS apps (pick your flavor) allow you to find someone with nearby proximity and do whatever. What a person does with the app; their intentions, are an individual thing.
You can meet "friends" on Grindr, but, it yeilds itself best to "I want a dick in my ass now" scenarios.
Whatever the case, if you are dating someone that doesn't give you exclusivity to their time and attention. Doing so "smothers" that person and it's a sure fire way to drive them away from you. You have to be secure in your relationship, or lack thereof. You can only control what YOU do, and not the other person.
Emotions like jealousy will destruct a relationship el pronto.
Most guys gays are visual, and things like Grindr really lend themselves well to all that.
Paying more attention to texting, an app, etc., however, when you're in a one on one scenario is socially clueless, rude, insensitive, and the sort of person who probably doesn't warrant your undivided attention, either. I.e., if that person has an interest in you, and you're compelling / interesting, it should naturally happen that you get their attention when you're together. That's doesn't mean hours upon end (folks get used to each other and affection can be unstated).