Chemistry.

We would not get along with everybody. We try to know each other to know if we would or could get along. Is it possible for one person to feel as if he/she has chemistry with the other while the other doesn't feel that way?

Chemistry between people can't be forced. Either to make it exist or to make them go.If they exist, they do. If they don't, they don't.

If there's a 'spark' or chemistry between you and him/her, then nothing would make it go away. You can deny it but you know it's there. And if there's none, whatever you do, they would not appear.