One he already mated and had a kid with an OW. She wasn't his FATED mate, but he loved her and mourned her and the child's death for 5 years. I could have lived with that but THEN he meets the heroine his ACTUAL fated mate and tells her "I'm never going to want a child with you" and she is A OK with this??!!
To be fair, the writing was good. I just HATED the whole plotline.