Relationships are worth fighting for but sometimes you can't be the only one fighting. At times, people need to fight for you. If they don't, you must move on and realize what you gave them was more than they were willing to give you.
Hopefully, people realize the great things they had when they are gone and don't lose something real. Always fight, until you can't anymore, and then be fought for.
Missing someone is a part of loving them. If you're never apart then you will never know how strong your love really is