1. That you dislike one of their family members. No matter what his or her family member did, you should not tell about the negative feeling you have towards their family members. This can make your partner feel bad and it might even bring about some misunderstanding in your relationship.

2. Complaining about something they cannot change about them. This can either be their habits or even their stature. If you know that there is something which you do not like about your partner, before complaining, you have to consider whether he or she is capable of changing it. However, if you find out that he or she cannot change that particular attitude or habit then, you do not need to complain about it.

3. Anything negative your family members said behind them. When your family members say positive things about them, you are free to tell them what your family said. However, if your family members made a bad comment, you just have to keep it to yourself as your partner might feel bad when you say it.

4. That you think their friends are cute. This might not go down well with your partner as he or she might find it offensive. Just know that people get jealous when their partner admires someone else. No matter how pretty or handsome their friends might be, just keep it to yourself. Things like things are better left unsaid as you do not have to appreciate your partner's friend's look in front of your partner.