The person i'm talking to blocked me on Facebook and said they don't have one, should I mention it?

I have been talking to this person for over 4 months and they told me they don’t have a facebook. I have two facebooks, one for family and one for friends. I have tried to search this persons name on my most used account and it appeared as though they do not exist so I said whatever. Then weeks later I tried again on my other account and do have one! I was really shocked because we are very close and I can’t imagine why he would block me. Should I ask him again if he has one and if he says no call him out on it or will I just seem weird? I don’t so much care about Facebook at all really, it’s the sneaky lie that bothers me. I wouldn’t expect him to do something like that and even worse that he obviously thought he blocked me….