Dear friend, when sibling relationship breaks up usually means 2 things.. If the relationship between siblings is tight and strong in the first place there is no need for arguments. Secondly, (which is the most common scenario) is when the spouse interferes. Problem is that people often like to control their spouses, and that causes a friction in any relationship. In order to prevent such misfortunate events, one must maintain healthy and constant relationship with sibling/s, but also with a spouse.Communication is the key, and honesty is always the best option. Hope this helps, yours truly AstroCoach

Have not provided enough detail to determine.

I am sure he still loves you and there may be no one at fault. Remember, he has a new set of priorities. He and his wife are now one with each other. Again, need more information.