It's so short but I feel like the idea is easily accessible. I've certainly experienced the association of previous pleasures with people from failed relationships and it's pretty brutal at times.

With that being said, I feel like this could be longer and the principle could be applied to a lot more things. Maybe more specific or personal references, I'm a sucker for stuff like that but you certainly lose readers when things become less accessible. 

Overall I really like the tone and idea.

I like the shortness, but I think it would be stronger if the second line didn't rhyme.  If it said something like  
  
I hate the rain.  
I hate the things you love.  
Oh, my newfound disdain for the rain.  
  
You've accomplished a lot in the three lines, and I wouldn't change a thing content wise.  just that rhyming throws it off for me.

[1](https://www.reddit.com/r/OCPoetry/comments/57xn6a/threeliner/d8w1gnc) [2](https://www.reddit.com/r/OCPoetry/comments/57vryf/fourline_poem_no_title/d8w0qq8)

    I hate the rain.
    What you love brings me pain.
    Oh, my newfound disdain for the rain.

The Rain