Can u be more elaborate on "setting good boundaries?"

U said: People will hit on you a lot if you’re a bartender and getting romantically involved with customers is usually a bad idea. -why exactly? R they trying to tick u off because they know u don't like it or what?? I mean, lets say if they do this to tick u off but u don't get ticked off which then reverses the situation-u will probably get stuck-how would u resolve it?

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