Well, here's the bottom line.
It was your responsibility to keep the dogs apart. They were in your care. That's on you but you already know that.
No, it does nto affect his male at all! So you did not "ruin" his male.
You will incur all the costs of caring for the female and the puppies. You will be the one that has to be responsible and make sure the puppies are in good homes. It's not like mutts are going to sell for a purebred price. So you have to vet the homes and then you should have a contract stating the dogs come back to you if they ahve to be rehomed.
So all responsibility and costs falls back on you. Tell him No. End of story. Let him sue you.
SG Seger vom Sitz vd Hose, IPO3, AD
G Faren vom Warkonhaus, Monkey in Training