Why the fu** is he cheering for Eliza ? Pretty sure at this point in time they literally have no relationship/engagement and all she did so far by what we've been shown is call him disgusting 😐
He even called her rotten, which makes even less sense then
I understand that he is trying to make his releationship with her better in case he can't avoid the farm life with her but suddenly approaching like that can be suspicious especially when he cheers her instead of his friend. The cheering part was really stupid imo.