You know when someone is about to leave, no one can catch her? You know what to do after she's leaving? You know what should you do before she go peace? I am coming and you're leaving, the plain common thing. Sometimes we think that this is a hard time, but actually it isn't, time will prove everything. Tell you a short story.
An old man ask a guy to taste the salt. He knew it must be salty but he still taste it. Then the old man ask him to take the bunch of salt and pour it into a pool. "Taste again," the old man said. Guess what, the water taste much more better.
So sometimes, it's not the problem itself tough, it's our problem. If you do have a big container, then the pain should be nothing to you. Sometimes if you think too much, it doesn't help. So what for you thinking backwards? You must, not have to, look and move forward, and not crying over split milk. Sounds very cold-blooded but trust me this is the best solution.