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.