@knowingthetruth,
It sounds to me as if he isn't ready to move on with another serious relationship so, yes, I do think you're 'wasting your time' if you want an immediate commitment. Four months is not a long time to discover if you're compatible. However, if you enjoy his company, why not just enjoy his company?
I think it's perfectly normal and very nice for him to spend time with her and their family. They were married for 34 years but it doesn't mean they can't still be friendly. They shared quite a bit over the years, after all.
If you're wanting a commitment from someone, you may have to find another gentleman.
Personally, I would be happy to enjoy his company and leave it at that. Not all relationships have to end up in marriage. There's a lot to be said for living on one's own and seeing someone from time to time.