Just want to know if my ex girlfiend after two years of relationship will ever come back to me

Probably not.

There is usually a good reason for breaking up, and you are usually not the same people that got together in the first place.

You can't ever really start over in a relationship.

My suggestion is to move on, because the odds of you getting back together AND having that work out are astronomically low.

After two years more than likely not and I hope you aren't sitting around waiting for her to. Time to let go (if you haven't) and move on.

Two years is a long period which can heal most wounds and people move on. If she had wanted to come back to you, she would have done it a long time ago.

Where did she go and why?

How long have you been over?