Is he in the wrong?

Just want to first off say this might not sound like any of my business but my husband and I have been dragged into this and we don't honestly know what to think or say. My husband's best friend who he has been best friends with since they were in 9th grade, now they are in their early 30s has been with his wife for a total of 7 years and married for one. She has 3 kids from three different marriages and he is a fantastic dad to them, but he has said in the past even before his wife that he was unsure if he ever wanted to have kids because he has never been around any. His wifes kids are either in high school or have graduated and now that we have two little ones and he has had the chance to be around a toddler and a newborn he has started to change his mind and thinks he wants his own kids with her. Tonight he called my husband asking if he can stay with us for a few days until he gets things figured out. He told my husband him and his wife got into a huge fight a few weeks ago because he brought up wanting to try for one of their own and his wife said she had no interest in having anymore kids so she went and got her tubes tied without talking it over with him first. He now wants to end their marriage but said the only reason he would stay is for her kids, he doesnt want to leave them. He said he is done with her and cant believe she would do that behind his back. Do you think he is in the wrong for wanting to leave even though he never really had an interest in having his own until recent?