Do you think it's wrong that I'm jealous of my partner's art career?
It makes you seem a little petty, why are you so jealous of their success?
Because my partner does not pay as much attention to me
You need to behave in a more supportive way towards your partner. Your behavior is selfish and self centered. Your partner may not be as supportive of your ventures if you do not behave less selfishly.
I feel like our relationship is second to their art career and it's not fair.
I know you feel a little jealous, but you need to put that aside and support their career. It's really exciting that their art has become so popular and you can celebrate that success with them. If you love them, you should support them.