I know how it feels to give someone your all and still feel unappreciated. Knowing you'd give that person your last, and they'd just take you for granted. At some point you have to realize you have someone else to think about, which is yourself. Realize what you bring to the table. If they don't compare to what you can offer, then leave them. It will just get worse and worse. Putting your all into something for nothing. All your doing is losing yourself trying to please someone else. Your keeping them happy but they don't even TRY to put in effort to keep you happy. 

                                    -lesson learned