How can I just stop hurting from something stupid?

i wish i had answers to questions like these, ill never understand why relationships just dont work. i wish that people would just stay together and heartbreak or regret never came. and how to fix things like this i still do not know either . i prob need to go off and think about this myself now. people say to forget the past and look to the future to me thats just not possible. im a guy that likes to fix mistakes and so when i have a breakup or something i want to fix it or get to the bottom of it when in reality i know that it is up to them and not me. you cant fix what they wont let you fix. i dk but i do know one thing to help you is just keep really busy and get a ton of things done in your life and that will help fix hurt feelings and memories. promise