GG, You are very new to the rollercoaster and it takes an awful lot of time to master the emotionally ups and downs. If you are sad, feel that sadness and then let it go. No one says you must put on a happy face each and every day. Learn to accept those feelings, allow them to wash over you and then release them. As you move along, the time span between the feelings of sadness, etc. will become less. Why? Because you will gain strength from what you have endured.
This is a time of learning for us as well as the MLCer. It's a time to rediscover who we were and got lost in the shuffle of life. We are all "fixers" in the relationships and now we must learn to step back and allow God to do the fixing. Some have had to dig deeper for patience. This is a virtue that we all have had to learn as well. Time to the MLCer is very slow, but to us it's moving rapidly.
It's okay to remain hopeful and optimistic, but also you need to move on w/your life. Leave the door ajar, but live your life to the fullest. As for the memories, think about them, smile and remember that you know that your relationship was not memorex. After you rebview them, put them in a box and set that box up on a shelf for safe keeping. Pull them down whenever you feel you need a boost to help you along the way.
GG, I kid you not, this is a very long and difficult path to walk, but you can do it. There are many who are walking this path and will be happy to pick you up if you should stumble. Do not be afraid. You have nothing to fear but fear itself.