Imagine finding out that your “best friend” has been dating your ex for a month and never had the courage to tell you. Yeah, true story.

I hate that I even have to write this article. Like, seriously, come on. This should be common sense, right? Simple logic.

For those simpleminded people who can't wrap their head around the concept of loyalty, here are 17 reasons you should never date your best friend's ex.

1. OK, first of all, good luck bringing that conversation up

I'd love to be a fly on the wall during that conversation.

2. Yes, she WILL care even if she says she doesn’t

Your best friend is going to want to support you because she loves you and wants you to be happy, but she's going to be torn between her love for you and the hurt of the betrayal. There are going to be old emotions involved and that's a lot to ask of someone. If you really care about her and don't want to hurt her, you won't even consider putting her in this position.

3. You'll have to choose between the two

You're going to have to make the decision between valuing your friendship or the possibility of falling in love. It's a tough decision and it's entirely yours to make, but if you choose a boy over your best friend, you better seriously reevaluate your friendship.

4. You might lose them both

You better believe that this is the man of your dreams because if you choose a fling over your best friend, she won't be there as your shoulder to cry on. You need to ask yourself, is this boy really worth risking years of friendship?

5. If you manage to remain friends, your friendship will never be the same

You're definitely going to lose her trust. You already dated one of her exes, who says you won't do it again? Please, for the love of God, don't do it again, once is bad enough.

6. You'll lose your other friends

Lord knows you're going to have some explaining to do to the rest of your friends. They were there to console her after the original breakup happened, but they might not be there for you. This is a major break in girl code and there may be a taking of sides. Be prepared to lose more than just the one friend.

7. Say goodbye to group hangouts

Not to mention it's going to be extremely awkward to bring your new boy to a party or to hang out with your friends when they know the history of the situation. It's like an unwanted reunion.

8. How would you feel if the roles were reversed?

Let's just bring this back to the Golden Rule we all learned way back in preschool: don't do to others what you wouldn't want to be done to you. Seems pretty basic right? How would you feel if your best friend went off and dated one of your ex-boyfriends? That's a pretty low blow.

9. It's NOT normal!!!

Seriously though, I don't care how many movies or TV shows show this happening, it is not normal for friends to play tradsies with each other's ex-boyfriends. That is all kinds of weird.

10. The jealousy will be unreal

If you thought dating a guy and being jealous of his ex that you didn't know was bad, you've got a big storm coming. If you date your BFF's ex-BF, you're going to know his ex, and you're sure as hell going to know how great she is because she's your best friend. Trust me, the fact that they dated is going to haunt you and you will start comparing your relationship to theirs. That's not a good place to be.

11. You'll compare yourself to her

Don't lie, we've all done it. More likely than not, you're going to compare your relationships to one another, and your boyfriend will do the same. Except now it's worse because you're being compared to your best friend. This for sure will put some strain on your relationship, you know if dating her ex hasn't already done enough.

12. It'll hurt you just as much as it hurts her

You're both losing your best friend and you're constantly going to be wondering if it was worth it.

13. You know their past

Best friends tell each other everything. She told you all about him, you were basically a part of their relationship. You know the good and the bad, and that's going to be weird.

14. You know the problems they had

You know everything that went wrong in their relationship. You know the fights they had and you know the reasons for why they broke up. What's to say these say problems won't ruin your relationship?

15. There could be hidden feelings

This definitely isn't always the case, but you never know if there are old emotions still lingering on either side. Do you really want to risk hurting your friend by dating someone they aren't over, or do you really want to date someone who isn't completely sure they want to be with you?

16. There are so many other guys out there

Honestly, there are 7.6 billion other people to pick from, did you have to choose him?

17. You get her sloppy seconds

Just saying.

If after all of this, you're still ready to date your best friend's ex, you need to think about if that friendship ever meant anything to you at all.