Let's face it, grindr really is not an app for relationships, it's more for hook ups / one night stands, so what did you expect?

As for the guy you met, maybe they had an open relationship. Maybe he had to have one last 'itch' before marriage, who knows. You wont get in a relationship with him, nor will you probably see him again.

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Stop stressing but I think the guilt is more less what he did and more, you feeling lonely and used. Perhaps you are seeking love and not getting it?