What might a man do early in a relationship that might make his new girlfriend suspect he's married?

A man might raise suspicions about being married if he frequently avoids discussing his personal life or deflects questions about his living situation. If he is often unavailable during certain times or has unpredictable schedules, it may suggest he has other commitments. Additionally, if he is secretive about his phone or seems to receive calls and messages that he hides, it could further fuel her doubts.