My first partner of half a year just broke up with me and it hurts like hell. It wasn't a nasty breakup, just on of the "my romantic feeling have been getting less and less in the last time and now they're not there anymore"-kind. 
If both of us want that, we'd really like to stay friends. 

Despite them telling me that they still like me platonically, I'm wondering if they actually like me or just wanna comfort me (a classic, I know). 

I am angry and sad but it really made me wonder if it's reasonable to feel these emotions about someone not liking me (in a certain way or in general). 
I do want friends who like me, who think I'm a fun person and enjoy spending time with me. When friendships (or in this case a relationship) end, I am devastated.
But at the same time, I really don't like myself. From the unreasonable selfhate in my youth, it has developed into something where I can actually point out which parts about me are bad and unlikeable. 
In essence: If I wasn't me, I wouldn't like me either

Is it fair and valid to be angry and sad at other people disliking someone I also dislike? 


Tldr: my partner just broke up with me and I'm wondering in how far it is even fair to he angry and sad that they don't like me, considering the fact that I don't like myself either.