I cut my finger on a can opener last night and now I'm constantly reminded of how sensitive I am

I wish my heart was calloused so I wouldn't ache everytime another meaningless occurrence reminds me of you
But hearts are not hard
They cant become calloused
And even though they are surrounded by bone, ribs are meant to be flexible

This finger will heal
It will scar and callouse with repeated use
My heart instead grows only softer and weaker with time
I dont know how much abuse it can take.