You have all of his attention when you’re talking and he keeps eye contact, something no man will do if he’s not really interested in you.
Men are visual beings, they love to look around to see if there’s something interesting to see.
But if you’re the only one he’s looking at, then he has already found it.
He will also always turn his body toward you when you’re together and will never pull back when you’re accidentally touching.
Other signs to look for are if he’s gesticulating a lot with his hands and if he tilts his head.
When men are comfortable around you and want to openly communicate with you, they will move their hands a lot when they’re talking.
And tilting his head while locking eyes with you is an invitation for you to talk to him, or if you’re already talking, it means he wants to know more.