First and foremost is to ask. After that you look for signs that he is NOT single. Such as...
- Ring marks where a wedding band usually sits.
- Paying for dinner/drinks etc with cash.
- Doesn't talk about his home or personal life much if at all.
- Refers to his supposed ex as his "wife" rather than "ex" or "ex-wife".
- Doesn't go out of his way to impress you OR goes over the top to impress you.
- Odd gaps or inconsistencies in his story.
- Intuition.
I catch these signs 99% of the time but I'm not infallible. Twice has a guy slipped by all these signs save my intuition. Sometimes it will just be an odd look on his face when I ask a question or just a nagging sensation, but the two times it happened, I ignored my intuition. :frown1: