You can get your boyfriend back after a breakup by being the girl he once loved, make him remember the good times you both shared together as a couple, figure out the things you did wrong and correct them.
1 Additional Answer
Getting your boyfriend back after a break up is not 100 percent guaranteed. However, there are some steps that you can take that may just help you to win his heart back. They include you being the girl he once loved. Show care and some attention but not too much as he should be more curious of your whereabouts. Recount the memories and try to convince him that your relationship is worth giving the second chance.