Not saying "I'm sorry."
After a big blowout when you can cut the tension with a knife, you might be thinking "this could all be over if he would just apologize" - but he doesn't budge. Even in the most PC times, many men have a hard time letting a woman get the last word. Most guys grew up in households seeing their fathers, grandfathers, and other men never apologize to the women in their lives. You can either suck it up and learn to accept his lack of progress or calmly explain to him that you are both equals in this relationship and that saying sorry doesn't emasculate him in any way.
He always wants sex at the worst times.
Men typically think of sex as a cure-all for any situation even an emotional one. They assume you will feel the same way. Just got laid off? Sex will take your mind of that. Having a fight with your best friend? Let's have sex to blow off that steam. It may seem like he's acting selfish, but he is only trying to help you the way he knows how. You can let him down gently and promise him a night of passion once your mood has passed or you can give it a chance to see if it actually works.
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He acts distant or mean to you when his friends are around.
When you spend time alone together your man may seem like the sweetest in the world, but when it comes to hanging with his crew he might act like he barely knows you. This typically goes back to the male-ego problem. Having his friends see him stroking your hair, holding your purse while you go to the bathroom, or blowing you a kiss from across the bar can totally blow his manly street cred. Either play it cool or skip the group hangouts altogether.