Writing as an old guy, I'd say you sound too high maintenance. Maybe he should leave.
Another person in a relationship of equals IS allowed to have different opinions, and doesn't have to support everything you do. If someone requires a person to support them 100%, then they need to move where slavery is legal.
BTW - English riding did not come before western. They reflect different riding styles that have both been in place before Columbus.
"Saddles were improved upon during the Middle Ages, as knights needed saddles that were stronger and offered more support. The resulting saddle had a higher cantle and pommel (to prevent the rider from being unseated in warfare) and was built on a wooden tree that supported more weight from a rider with armor and weapons. This saddle, a predecessor to the modern Western saddle, was originally padded with wool or horsehair and covered in leather or textiles. It was later modified for cattle tending and bullfighting in addition to the continual development for use in war. Other saddles, derived from earlier, treeless designs, sometimes added solid trees to support stirrups, but were kept light for use by messengers and for horse racing."Saddle - Wikipedia, the free encyclopedia