What is micro-cheating? Relationship experts share what to know and how to prevent it.

With cheating in a relationship, whether physical or emotional, it's typically clear when things have gone too far — but what about your partner seemingly turning up the charm for a friend or co-worker? Are they flirting or just being friendly? 

According to relationship experts, those subtle acts may be "micro-cheating."

"Micro-cheating is the small behaviors that can sometimes be hard to pinpoint or prove that indicate there are boundary violations in a relationship," Molly Burrets, a clinical psychologist specializing in couples therapy, told CBS News.