No, that’s not what Matthew 8 says.
All Matthew 8 says is that Jesus went into the house of Peter’s mother in law.
Yet, we don’t hear anything about his wife? Why was his wife not accompanying Peter and Christ to the house of her mother?
At the very least the only thing you can assume from Matthew 8 is that at some point Peter was married. We do not know that she was still alive at the time. Nowhere is her name recorded in scripture, unlike many of the other people.
As for Corinthians, I’m not sure the passage is referring to Peter’s wife. It’s not as an unambiguous passage as the one in Matthew 8.
If that’s all the evidence you have for your position that Peter’s wife was alive when he was an Apostle, then I’m sorry, you haven’t convinced me that you have correctly interpreted scripture.
if i wasn’t married to my husband his mother at that point wouldn’t be my mother in law
and there is a scripture somewhere in the NT (don’t test me please) that says you can’t take away from or add to it and it still remain the word