The saying is "keep on, keep'n on". It's NOT if you feel like it. If you obey the saying (personal experience here) you'll soon find your enthusiasm returning. Often it's advantageous to have a friend or relative stirring the imagination, setting a time frame and instituting the action. If this gives rise to a series of events---even better.
It does take 2 or more to share, so take the first step towards reliving happy times and begin making some new memories. If there are some kids that can be involved, maybe Grandpa can teach some skills and create memories for the young 'un too.
Today is Thanksgiving, moping around feeling sorry for oneself is pretty poor thanks for the living.
I pray that, should I be in a similar situation, I can follow my own advice.
Kurt & Ann K.