Sigh boyfriend giving me issues

So I started my fitness journey about a year ago and love what I've achieved 
My boyfriend does too we've been togther five years
Lately though he's calling it a waste of time blah blah I've also started pole dancing fitness which is purely for fitness and actually quite fun to learn 
Not like I'm taking my clothes off or anything and he's just not happy about my gym and fitness etc
He keeps putting me down about it. Saying I need to find something more constructive to do
It's beginning to cause unescessary fights ;( I really enjoy all this though and I'm paying for it all myself