Tail chewing

I dropped the divider a few weeks ago and the male has left her alone for the most part but seems to like chewing on her tail

Will this work itself out if I leave them together or should I put the divider back up.

She is eating like a pig and acting as a healthy ray should, she also has some very slight bite marks near the rear of her disk so he might also be trying to knock her up

Yah, I am kind of stuck in between dividing or not. The damage to her tail is already done. I am pretty sure she is not sexually mature but anything is possible I guess. I am glad it is just the tip of her tail and nothing serious yet

I think I may monitor it for a few more days than throw in the divider if it gets worse, I hate to keep throwing a divider in there because it isn't very fair to the other fish who appreciate the swimming space