When was the last time you went to gym? We're sensitive about our looks too, OK? While I definitely think fitness should be encouraged by both parties in a relationship, it has to be done the right way, and pointing out our flabbiness is not it.
I am too sleepy not today please. This will make him wonder if he is with the right girl. By denying him of any kind of bedroom thrill you might pass on the message, though inadvertently, that 'sex with you is no longer pleasurable. He might think idea of love making puts you off and this might create a distance between your relationship.
Do you still love her? If you want to know about his past and find out about his intimacy about his previous girlfriends, be watchful and do not insist. Many times you would end up reminding about his ex and it will bring up the distance between your relationship. He might think you do not trust him.
He is so strong / smart. You can never be like him. Comparing your man to others is a big turn off. We are your assigned protector. We are the manliest man you have ever met, ever will meet, or can even imagine. So, simply stop making them, even if they are genuine.
Do not Insult his mom or pass any comments which may hurt. Yes, this is one relationship a guy would never allow you to meddle with. If you think there are indifference which may put you in discomfort, carefully voice them to him or he will simply regard you as disrespectful towards elders.
Do not use F words. F words may go well in general conversation, but do not use it on your partner which can turn out to be disaster during fights. Even if you both make up later, he might never be able to forget it completely.
J I hope this is informative. Thanks for reading.