1. Treat a waitress/salesperson/employee of any business you find yourselves at with disrespect.

If the person you’re dating has the nerve to publicly humiliate or disrespect a perfect stranger – whether it’s because the restaurant is out of the food they wanted, or the store won’t accept their coupon, or whatever – it’s completely unacceptable. After all, if they’re willing to do this to somebody they don’t even know, then who knows how they may treat you?

2. Tell them to make changes to who they are in order to “keep” you.

If somebody you’re dating tells you to make a change that is greater than getting food out of your teeth or fixing a stain on your shirt, then I have something you can change too: your significant other.

3. Be racist/sexist/homophobic/generally bigoted.

Nobody likes a bigot. If you say something offensive, even if it’s just a joke, not only do you never know who you might insult (and this includes your significant other), but apologizing profusely to the people around you because your significant other has about as much tact as a car horn is going to get really old really fast.

4. Come on to other people, in front of you or otherwise.

This should really be a no-brainer, because if you’re still “looking,” so to speak, then you shouldn’t be in a relationship. Period. I highly doubt your significant other will appreciate hearing about how hot that girl across the room at the party is, and I know they won’t appreciate you getting all touchy-feely with that guy at the bar talking about how “strong” he is. It’s just insulting.