Bf gave me a promise ring! 😍 But....

Tina

My bf gave me a promise ring that I absolutely love. However he got it in a size that only fits one finger (ring finger) which would be fine but I wear my grandmas ring that I've been wearing for years on my middle finger (only one it fits as well)

So my question is should I stop wearing my grandmas ring or pay the probably $80+ to get the other one resized?