hold his hand and feel his pulse through his wrist if you can indiscreetly, also watch their neck when they are talking, if they are lying the anticipation will cause their excessive heartbeat to really make the skin protrude when the blood gets pumping.
to catch the guy, their pupils will get smaller. if it doesn't work, it's my relatives fault cuz he told me that's how you catch a person when they are lying.
The guy will be sweating and he will be smiling nervously!
then hes a liar
Usually you can tell if someone is lying by the look on his/her face, they either look too serious or they are slightly smirking.
You can detect if someone is lying is if they do not look into your eyes when they are talking to you about stuff. However if thelier is good at acting then all you could do is catch them in what ever they are lying about.
He's lying
When a that guy says the question with a smirk and he is jealous of the guy he is asking for.
If a guy really loses your number then he will most likely ask for it again,but if he is lying then he just won't call you or won't ask you for it again.
Ego
Stop lying
1.Bedroom (on a bed) 2.Park (sitting under a tree) 3.On your sofa (if your a guy , lying down on the bottom and the girl lying on top of the guy ) Where ever both are comfortable.
Stephanie Meyer said she had a dream where there was a girl and a guy lying in a meadow together, and the guy was sparkling.