My ex-girlfriends.It is best not to revisit past relationships if things did not end well. This is because if we were incompatible and had some serious issues, it would still be a bone of contention if we were to get together. It’s easy to fancy an ex in a moment of weakness, especially when you are lonely. You may choose to forget the reason why you broke up and jump back in the relationship, only to regret it.My best friend’s sister.Talk about anything and I mean anything apart from your best friend’s sister. Not only will it destroy my friendship with my closest pal, if things don’t work out, I am also likely to be at risk of being punched in the face for hurting his little sister. It’s also impossible to talk to him when things are not going great between us, as there’s a direct conflict of interest here, and he may not always choose my side.Women who are bad news.You know that dating her can be fun, but it will get you into a lot of trouble. Always remember it’s best to be safe than sorry. Do not give into temptation or you will regret your decision for the rest of your life.The high-maintenance gold digger.I’m so planning to run far away from these ones. Not only will she expect me to attend to her every whim, but she will also find faults with me and blame me for spending too much time at the office, ignoring the fact that I am working hard so that we can live a comfortable life. It won’t end there; her "good friends” will encourage her to throw me out the door when she wants to get out of the relationship.Your friend’s ex.This is the number one reason to be called JUDAS. And I won’t let this ruin my relationship with a pal as the saying goes Bros before W*%@#. Word will go around my circle of friends and it will do no good for my reputation. Besides, if he has not moved on, it will make things really awkward whenever we meet up with common friends.