Friends go away, die, disappoint you. Friendship isn't worth the maintenance and ending of it, for every minute it might make your life better (and doubtfully so) you will get two minutes of misery.
The only semi-reliable friends are family members, and even if they are loyal to a fault, they do have an expiry date.
Get used to being alone, the sooner you prepare the better.
Your sad comment reminds me of this stanza: "The sweeping up the heart, / And putting love away / We shall not want to use again / Until eternity." (Emily Dickinson)
Dickinson had a ton of family members die in rapid succession, so she probably wrote that in the fallout of deep trauma. Still, there's something to be said about shifting the "fulcrum" of happiness within yourself and being more emotionally self-sufficient, if you can. Ironically, that can also make you a better, less co-dependent friend/partner.
The only semi-reliable friends are family members, and even if they are loyal to a fault, they do have an expiry date.
Get used to being alone, the sooner you prepare the better.