Your male is probably trying to mate. I have a male Greek tortoise that will continuously chase and ram my female if I don't keep him separate.

I only keep the male with the female when I am intentionally breeding them, and when they are outside. Otherwise, I keep them separately so that my female doesn't get stressed out. If you have a really large place to keep them in, you could try adding some half logs and sticks to break the line of sight.