-What are your ages?
-How long have you been together?
-Do you want to make the relationship work?
-Could you explain your situation a little more?
It doesn't seem like it's just one thing that bothers you about your boyfriend it seems like there is MANY things about him and his mannerisms that bother you on a daily basis, from the way he buys nothing for your son but gets his son from the previous relationship everything or doesn't spend quality time with either of his sons and would rather be on the computer or doing something else also the fact that you have to do everything without having a break from your son. What you have to do is communicate how you are feeling and the things that bother you instead of holding inside to fester inside of you. Communication is the most important aspect of any relationship. If anything is bothering you in your relationship then it is important that you bring it up and discuss it with your boyfriend. Holding it in and trying to ignore it is only going to make you resent him after a while and I think that you are at that point now, which can lead to a break up very quickly. Sometimes communication can be quite difficult for many reasons. Maybe you simply don't want to hurt their feelings, or you are uncomfortable talking about what is bothering you. No matter why you are unhappy with the relationship, you need to find a way to tell your boyfriend how you are feeling about everything.
If you feel unable to speak with him face to face or are afraid it will cause a verbal fight, you can always try writing down your feelings in a letter. This gives you a chance to get your feelings out there in the open and put a lot of thought into how you are wording it. Give this letter to your boyfriend, and then follow it up with a serious conversation about the issues and how you feel like you are at the end of your rope. Finding out how to save your relationship cannot be done if you don't communicate with him. If you want to fix the relationship then you will need to talk to each other, make compromises, and speak rationally or your relationship will not make it. If you have tried to talk it out or told him how you feel and you feel like you just want to leave and are sure that is what you want to do then you have to be sure that you do not want to try with the relationship anymore. Breaking up on a positive note may seem like impossible. It's really important for both you to go about it the right way. It is never easy to end a relationship but if you are not happy and you feel that things aren't going to change then you have to do what is best for you and your son together you don't want to end up hating each other later on down the line. So make sure the relationship definitely cannot be salvaged before you make the decision to walk away but also make sure that you can keep your sanity for the sake of your child also. Don't take the drastic step of breaking up unless you are very sure that this is what you want to do. Think through your decision very carefully. If you really just want to change some things about your relationship then think of ways to fix it instead of breaking up.