rollercoasters zebras and you

I'm yours will always have a special meaning, And when things are bad you pull me through, But my patience is slowly weaning, And I'm sick of crying over you. It's a constantly changing roller coaster And the end was never built. So we ride endlessly up and down; And I've had it up to the hilt. I know you don't mean it to be bad, And sometimes I overreact. And at times you're oh so sweet - I nearly have a heart attack. But being ignored and tossed aside, Even if it hurts you too, Makes me want to get off this roller coaster ride... I should have went to the zoo. Because Monkeys and zebras Can be rather civil at times, And "roller coaster" Is rather hard to rhyme... I'm done rhyming over you.