Nothing will ruin a relationship for me faster than watching your partner showing up for other people in a way they don't show up for you. You have the capacity, just not for our relationship? no thanks.
Goes for friendship too!
It's okay. To wear old clothes. To not upgrade your phone. To buy second hand items. To live in a simple home. It's okay to live a simple life.
A simple problem free life is far better than being rich and having no peace of mind