Why are you still single...having cold feet on commitment or just got fed up of relationship?

I'm 55 now. Was married until '97 then she left me with the kid and went to CA. Another friend of mine who I was helping with her kids wanted me to marry her but she died of ovarian cancer (we kissed once). Have a friend that lives nearby that I dog sit for and we go on trips together but she doesn't want to get married and she's quite a bit older so has no interest in anything physical. She's in Canada visiting her cousin now. So I'm sitting at home with the dog and on here.