The quickest way to rectify that mistake (choosing the wrong person) is by learning from that, moving on, and choosing much more wisely in the future.
If he’s not calling you, it’s because you are not on his mind. If he creates expectations for you, and then doesn’t follow through on little things, he will do same for big things. Be aware of this and realize that he’s okay with disappointing you. Don’t be with someone who doesn’t do what they say they’re going to do. If he’s choosing not to make a simple effort that would put you at ease and bring harmony to a recurring fight, then he doesn’t respect your feelings and needs. “Busy” is another word for “asshole.” “Asshole” is another word for the guy you’re dating. You deserve a fcking phone call.