Certain signs of infidelity are clear: lipstick on the collar, smell of perfume and Sunday-night business meetings. But there are less-obvious characteristics that almost all cheaters share. Do one or two of these a philanderer make? Not necessarily. But if the below rings true about your guy and your instincts tell you something's not right, you might want to check that collar. Photo by Thinkstock
1. He's secretive, especially about his phone.
He's on it more often (and often outside), he ignores calls, he changes his passcode frequently or he suddenly starts leaving it in the office or car. He's trying to lock you out of his life, literally and figuratively. "Trust your gut here and confront him," says Danine Manette, a professional investigator and author of Ultimate Betrayal: Recognizing, Uncovering and Dealing with Infidelity. "Most betrayed women report that they saw this sign, but either ignored it or explained it away."
Related: See the 10 Read More »from 10 Surprising Traits Men Who Cheat Have in Common