His profile might also not contain a photo at all, which is another red flag.

This is especially true if he seems cagey or nervous about revealing too much information about himself.

Knowing someone’s last name is also a safety issue. If he hasn’t told you his full name before you meet up, think twice about going to see him. There’s no good reason for a person to hide their identity.

It’s also a bit unusual if he repeatedly asks you out on weeknight dates.

A married guy will pick places where he’s won’t be spotted by anyone he knows. For example, it’s a bit suspicious if you suggest a spot that’s close to him and he immediately shoots you down.

If you ask about this roommate, he probably won’t tell you their name or offer to introduce you.

Watch out for men who claim to be “separated,” too. Separation doesn’t equal divorce.

For instance, if you ask him, “Where did you go to college?” he might reply with something like, “Oh, just a state school in Virginia. What did you major in?” Or, if you ask, “What do you do for work?” he may respond with something vague like, “Just computer stuff, it’s pretty boring. How are you liking your job?”

Plenty of single guys are just interested in hookups and some married men want emotional relationships, so this alone isn’t the best indicator.