"Lately I have noticed all my friends avoiding me" -- what is this song?

This is bugging me -- I must have heard this song quite often in the 1990s, or 80s or even before, but can't recall the title or who sang it. I can remember the words of some of the verses, and I'm fairly sure the first verse started:

"Lately I have noticed all my friends avoiding me

And that girl who loved me up and said goodbye"

And another verse may have started "Lately I've been thinking of nobody but myself".

For the life of me I can't recall the tune or words to the chorus, which I'm sure would hold the key to the title. It was a male singer. It seems to me it might be a Don Williams song? Or possibly one of Ray Stevens' quasi-religious ones? Google has not revealed anything. Any help gratefully received! Many thanks.