1. His many female friends
If your man is spending time with lots of females and doesn't care what you think about that...then don't waste your time. Chances are, he did it before and he will do it again
2. No apology, no remorse
If the first time around you caught him in a lie and his apology was anything but the most heartfelt and sincere thing you have ever heard, don't bother with another chance- he ain't sorry
3. He is always out and about
If your man is always busy and prefers to spend time with his friends/work than you, then don't put yourself in the situation where you end up hurt again.