He's Just Not That Into Me?

I've recently met somebody.  And I really like him. Except it's been so long since I dated that: 

1: I'm hopelessly out of touch
2: I'm not sure how to approach the whole "wait 1 day to contact him / name your children etc etc "

I've been single for 2.5 years and I'm ready to begin dating.  Especially when I meet a cute,  intelligent,  decent guy.

I don't want to let the opportunity pass me by with him thinking I'm not interested.  But at the same time I can't be too eager. 
I'm naturally a talkative person and I love Whatsapp but I find that I need to curb my natural reflex to contact him when I'm thinking about him (which I find myself doing alot lately )

We've been out alone together twice, and we have a great time together,  talking into the early hours of the morning.  We have great chemistry and I am ridiculously comfortable with him.  And my cat loves him-  all good signs.  BUT....  He seems to be content to "let things happen at a leisurely pace" and it's beginning to frustrate me.  I'm more of a "let's make this happen" type of person.
I don't want to get pushy and potentially ruin this,  but I just wish I knew how he felt about me! 

He's only been single for 6 months (3 year relationship ) so I guess I should give him time? 
But what if I give him time and it turns out that He's just not that into me? 

I wish I could just touch a piece of litmus paper to his skin and it would turn red to show he likes me or blue to show he doesn't .

Give me strength..  I despise all this second- guessing and wondering.