Is it ok to love someone and live entire life with that feeling even if the person won't be yours ever?

Why not healthy?

You may lose out on something real with someone obtainable if you lose yourself in someone unobtainable. I know from personal experience.

@TheCaterpillar: What experience?

I've wasted a good portion of my life loving someone who didn't love me the same way.

@TheCaterpillar: But did they not understand you so well and be your friend?

He's still my friend and it still hurts

Do you meet him? Are you married?@TheCaterpillar:

I was married to him, we are divorced now. I wasted almost twenty years on him. I wouldn't advise that.

Sorry to hear this! @TheCaterpillar: