She is one of my colleage I like her most . Earlier we were friends but due to some reasons(her ego) , its ends.now I want her to like me , I know she has a byfriend he is jaipur.she likes me but she didn't told me yet , she always whenever I'm in frnt of her.

Give up and move on.
You CANNOT make anyone like you, there's a small thing called Free Will that gets in the way.

That's never an easy situation. Here's a guide to help you out: https://www.askmehelpdesk.com/dating/guidlines-what-do-do-if-person-like-already-relationship-463250.html

Whatever you decide to do, make sure you're ready to face the consequences of your actions. But if she doesn't feel the same way, then there's nothing you can do.

I agree, you cannot MAKE someone like you.

And if it were possible, no one here will help you steal another man's girl anyway.

Go find one of your own.

The world is full of them.

She already has a Boyfriend so you leave her alone , how would you like it if she was YOUR Girlfriend and someone else was trying to steal her off you??

You can't make someone like you. The train has left the station man! She is taken, and you can't make her like you.

Drop the idea and move on... might take some work, but its worth the effort!