How can i break up with my boyfriend/partner without getting hurt?

WOW, I didn't bother reading all that! People rarely change, so if you don't want his personality traits projected on to your future children, leave! Walk away, there are SOOOOOOOOO many other options than to settle for him. Now, if you love him and choose to spend the rest of your life with him, that's different, but it doesn't sound like you are in love!