Hmm, I couldn't find him as married to himself. Altho I only looked at the first three profiles, and not the tree.
Which leads to the first tip: Finish the merges, if possible, first and then that kind of change becomes a lot easier.
Second tip. Select edit profile, then relationships, and wait for the relationship section at the bottom of the screen to load. This will show his connections to the tree and allow you to remove.
However, I recommend the first tip.
Hope this helps.