Can you give me tips on how to love someone w/out expecting anything? I've been seeing a guy for 20-months. It can be difficult because no one knows about us & (while one conversation possibly hinted at it) he says nothing about future plans including me.

It's past time to have moved on. But since you have endured and enjoyed his IMO lack of respect towards you. You could continue or not. It's really is your choice.

Furthermore, there're no tip(s) to love or give love to anyone who doesn't want to love you in return. 

Why bother. Don't you deserve someone to love you back? You should set the bar higher.

That said, Ive seen lots of people who say they love Jesus, seems to work out in their minds.

This "relationship" .. And I use that term loosely .. Is disturbingly suspicious. 

I feel compelled to ask .. Why the secrecy? What is he hiding? Is he married, is he ashamed? Why wouldn't he want to tell people you are seeing each other ?  Is this a relationship of convenience .. For sex .. What's up wit dat?

There ARE no tips on how to love someone who can't or won't love you back. I'm thinking he is not sharing thoughts of a future with you .. because there isn't one.

Unless you are two consenting adults that have consented to engage in a sexual relationship without any strings attached .. then THIS is a scenario you should back away from, and run for you life.  Persuing this is destined to fail, and the fallout could be devistating.

You have apparently been doing it successfully for 20 months---I don't see how I could possibly come up with additional suggestions.