How can I tell if a guy is lying about having a girlfriend?

There’s a guy I’m interested in, but sometimes I get the vibe he might already have a girlfriend. What are some subtle signs a guy is hiding another relationship, or am I just being paranoid? Has anyone ever caught someone lying about this before?

Trust your gut. If his phone is always face down or he guards it like it’s the crown jewels, that’s a major red flag. I learned that one the hard way.