You could ask him to use video skype etc on his phone or laptop and take you on a tour of his house into all the rooms. If he says he needs a week to prepare then something's up, but if he says, sure i'll do it now then probably everything is legit.

He has to go all of the sudden..he's hard to talk to on weekends. He has excuses if you want to call, or him to call you.

you could find out on his soical media , and see who is close to him or flirt with his friend on line and find out his dirt , or if his phone rings a lot or he got excuses , you will know ,,

Well the first would be.. When he gets home does he stop talking?
Does he only talk while he is at work or during the day?

Ask for his legit Facebook or other SN account he has.

Call him in the middle of the night and see if he answers?

First would be that you’re asking.

Ask him

Long distance is called pen pals. Not a relationship

Always check tan lines

I couldn’t imagine how someone could do that to another. I would think it would be difficult. That type of person is a master at deception.