Being helpful is, of course, a great trait in any person, because not everyone has a selfless nature. However, there are times when you have to be aware of whether someone really needs your help or not, for you may overstep in your attempt to help and just worsen things.
Just like the original poster’s (OP) boyfriend who took things too far while he kept offering to ‘help’ the poster’s blind sister-in-law. Annoyed by this constant nagging through the whole night, the poster’s brother kicked the guy out of the house!
More info: Reddit