We also know that its no more in our hand but we are too afraid to face the reality. But when we show courage and open it, yes, there are marks that water was there(wet hands), but for a certain duration, then it would get evaporated. But if we are not ready to open it, we are betraying ourselves and not giving a chance to be alright again in the illusion of having it in our hand. And when we think so, we have all our concentration there and we ignore to think that by doing so we are blocking all other aspects of our brain. Then wish her/him well and try to stay away for you want her/him to be happy, if you truly love her/him. Don’t fake your feelings. Cry if you want to, get angry if you want to, but process all those emotions fully. Time may lessen the pain. Have this in mind that you will never be completely over her/him, but you will have to start to learn to live with it.
I can completely empathize with you and I know that pain as I have been going through the same for more than three long years. It is tough. But in my case, I want her to be happy even if it doesn’t involve being with me. Love is about wanting the other to be happy, not about possession. My two cents. Unrequited love is really painful. Especially if your feelings are genuine and you love him/her to the truest of your senses. It kills you everyday to realize that he/she doesn’t love you back yet. And worse is getting ignored. But the thing about love is, it is always unconditional. You love him/her because you want to, not because you want him/her to love you back. That’s what love is all about. Just be true to your feelings and try to stay away from him/her in order to avoid the pain.