Yep, it's easy to say "find new girlfriend" but if I don't need a new girl friend and I need my girlfriend? What can I do for that? Do you think that Santa can make this for me? I believe in Santa, but unfortunately I don't think that he can do that for me
This is part of life, sometimes we want to be with a particular person but that person does not want to be with us, we must try out best to convince that person that we really really want to be with them, if they insist they do not want to be with us, I think we have to accept that decision and move on.
I think I saw a poem that says: If you love something (or someone) set it free, if it comes back to you its yours, if it did not comeback to you, it never was yours. I hope that is of some comfort.