having friends is hard

I've always been really bad at adapting & adjusting to changes in my life. People change all the time & I find it really hard to accept different versions of friends you were once close to especially if it is a version of lesser quality. I guess that's why they say friends "grow apart" sometimes. I understand the notion but it's so hard to go through. When these things happen in romantic relationships you just break up but in non-romantic relationships you just have to buckle down for the painful fade out.