Feedback please

Yesterday I just discovered that my exN has done a good deed on my behalf and then came home to a cleared driveway after my city was hit with about 6-8 inches of very heavy wet snow. After speaking with a neighbor, I've learned that it was exN who came over and cleared the snow. No note, text or call has been received.

The other good deed was done a few months ago and I didn't even know about it. I had a rather large outstanding balance on a veterinary bill for a surgical procedure on my cat. I was paying it off in monthly payments. I realized that I hadn't received a statement in awhile and called the vet to make a payment by phone. They informed me that the bill was paid in full. I had them do some checking to tell me who paid it and they said their records indicated it was paid with a check from exN back in November 2012.

He had NO reason to pay this bill and we've been out of touch for many months. He uses the same vet (I introduced him to the vet).

My first thought was that this was an attempt to get me to contact him (which I have not done) or he was trying to impress someone at the vet or one of my neighbors.

Not sure about this one - any advice?