Recently, I found several strange short messages on my father's mobile phone, which seems to be very close to my father. I don't know how to deal with it.

This kind of thing is difficult to handle, and your parents are still arguing, which makes the child have to think in that direction.

My advice to you is that we wait and see. Don't ask this directly yet. You can beat about the bush. We need freedom and space, and so do our elders.

In short, I wish you good luck and handle this problem properly.