Dissoamity
noun
A peculiar heartache seeing your best friend morph into your harshest critic, their playful teasing once leaving laughter, now casting shadows of doubt that weigh heavily on your self-worth.
From Latin 'dissolvere' (to loosen or break apart) + 'amīcitia' (friendship), suggesting a cracking in the bond of friendship. Pronounced "dis-soh-AM-i-tee"