I can't give you advice on your relationship with your boyfriend. But I recommend that you take lessons from a pro. Learning to ballroom dance isn't exactly natural, and it requires (among other things) getting rid of some mistaken ideas--it's not the steps, at least they aren't the most important things--and a pro will have a better idea of how to get past whatever problems you may have. (It's a paradox--when you get to be an experienced dancer, you may wonder why people have trouble learning something that's so easy.) If you live somewhere where there is a USA Dance chapter, they may be able to help you find dance classes (group classes are a good way to start) that won't break your budget. Finally, it may help you to learn from someone with whom you don't have a personal relationship.

If your BF has been dancing seriously since 2008, by this time he should be relatively advanced. He might be forgetting what it's like to be a beginner and is having a hard time getting back to the "newbie" mindset.

BR is not inherently more difficult than many things, but it takes work to get to a level beyond basics. That includes private lessons and lots of practice.

Some (many?) of us could not imagine a longterm romantic relationship with a person who doesn't like / do ballroom dancing - it's that important to us. It's a positive thing that he wants to involve you; you need to understand that dancing can be as addictive as running or golf, etc. and be an extremely important part of life.

Good luck!

Find a new Boyfriend.