It's Raining In Love by Richard Brautigan

I don't know what it is,
  but I distrust myself
  when I start to like a girl
  a lot.
  It makes me nervous.
  I don't say the right things
  or perhaps I start
  to examine,
  evaluate,
 compute
  what I am saying.
  If I say, "Do you think it's going to rain?"
  and she says, "I don't know,"
  I start thinking : Does she really like me?
  In other words
  I get a little creepy.
  A friend of mine once said,
  "It's twenty times better to be friends
  with someone
  than it is to be in love with them."
  I think he's right and besides,
  it's raining somewhere, programming flowers
  and keeping snails happy.
  That's all taken care of.
  BUT
  if a girl likes me a lot
  and starts getting real nervous
  and suddenly begins asking me funny questions
  and looks sad if I give the wrong answers
  and she says things like,
  "Do you think it's going to rain?"
  and I say, "It beats me,"
  and she says, "Oh,"
  and looks a little sad
  at the clear blue California sky,
  I think : Thank God, it's you, baby, this time
  instead of me.