I remember a Belgian movie about this, he was the last person on Earth and he was a farmer, he was lonely but he had a sow which he eventually fell in love with, he had piglets with the sow and was a loving father at first but he eventually became jealous because the piglets prefer their mother over him so he killed the piglets by hanging them, when the sow found out it committed suicide by drowning itself, the farmer then fell into great depression and despair and he ended up committing suicide by hanging himself.