1 / 10

To the Left - He’s extra protective of his phone and too busy to spend time with you. Could he be cheating? While the individual signs here don’t necessarily point to cheating, if you’ve observed two or more of these things, it’s time to have a conversation with your man. By Kenrya Rankin Naasel (Photo: Blend Images/Hill Street Studios/Getty Images)

2 / 10

He’s PMSing - Talk about moody. He suddenly gets angry out of the blue or, conversely, is being really, really nice to you. Cheating men have been known to pick fights to get out of the house. And uncommon sweetness could be his guilt kicking in if combined with other signs. (Photo: Thinkstock Images/Getty Images)

3 / 10

He’s Taking Better Care of Himself - The man who hadn’t seen the inside of the gym in a year is suddenly hitting the weights, sporting a fresh haircut every five days and wearing brand new clothes. He could be getting clean for someone else. (Photo: Joseph C. Justice Jr./Getty Images)

4 / 10

He’s All Mixed Up - He makes a reference to that crazy scene in Kevin Hart’s last movie, but you didn’t see it together. Or he swears y’all ate dinner at that new Indian place downtown, but you haven’t had tandoori salmon in months. Sounds like somebody can’t keep his women straight. (Photo: Diane Diederich/Getty Images)

5 / 10

He Has a New "Friend" - We all know it’s hard to meet friends as adults, so how is it that he suddenly has this new chick who is the homie? The more she pops up in seemingly innocuous conversation, the more likely that she’s not just a friend. (Photo: Sam Edwards/Getty Images)

6 / 10

His Taste Has Changed - Whether he’s listening to R&B when he used to hate it or has a newfound appreciation for pinot grigio, something (or someone) is exposing him to new things. When you ask about it, he has zero explanation or mentions his new “friend.” (Photo: Mint Images/Tim Robbins/GettyImages)

7 / 10

He Has Become Private - His phone now has a security code on it, he’s taking calls in the bathroom or he has suddenly become the king of taking long walks to clear his head. What is he hiding? (Photo: Hero Images/Getty Images)

8 / 10

He’s Switching It Up in Bed - Maybe he’s uncharacteristically aggressive during sex or he’s using a new technique. Or he’s trying to get you to do something you’ve never discussed. Either he’s been watching a lot of porn or he’s picking up new tips one-on-one. (Photo: Adamsmith/Getty Images)

9 / 10

He’s Sooooo Busy at Work - He could be using work as a cover to go out with the side chick. Or the side chick could be in his office; studies say that 60% of affairs start at work. (Photo: Inti St Clair / Getty Images)

Photo By Photo: Inti St Clair / Getty Images

10 / 10

You Feel It in Your Gut - Trust your intuition. If something seems off, even if you don’t have evidence, there probably is something going on. Talk to him and find out what it is. (Photo: Tetra Images/Getty Images)