8. He had doubts about moving in or getting married.
This is a biggie, says Maria Bustillos, author of Act Like a Gentleman, Think Like a Woman (Accidental Books). A man who is not entirely invested in a relationship is always looking for an exit, making him vulnerable to the temptations of infidelity.
“If some woman finds him attractive and busts a little move toward him, he may go for it because he wants out, whether he knows it or not,” she says. People often don’t leave without somebody else lined up.
9. He’s not hanging out with you as much.
You’re watching TV; he’s on the computer. You go to bed; he stays up late. Sound familiar? You’re in the same house but not really together.
“If a guy is organizing his life to spend less time with his partner, it doesn’t really matter whether he has met someone,” Malkin says. Such behavior signals a distance that’s “always a breeding ground for infidelity.”
10. Or he’s more attentive to you.
A sudden shower of gifts, flowers, jewelry — and it’s not your birthday. Nice — or is it?
Maybe these are impulse buys because he’s a prince. It also could be a diversion or motivated by guilt. “If you’re happy, you won’t question him,” Dr. Leslie says. “Then, if he wants to go out with the guys,’” you’ll say OK. “But really he’s taking another girl out for a date,” she says.
Same goes if he’s suddenly calling and texting you frequently. Women believe that the more a man calls or texts, the less likely that he’s cheating.
But it’s actually a preemptive strike, Dr. Leslie says. “All it means is that he’s giving you enough contact for you to believe he couldn’t possibly be with another woman.”