I have to put my rat down, help;(?

You are in the same prob. i was in my rat Ivy had a tumor on her neck I loved her more than life and i didnt have the money to take her to the vet eather. When she dies keep her in your arms so she know what you are there for here and you love her and u didnt abandon her if you let her go she will die sad and alone if u have already let her go its not ur fault u didnt know its not easy to lose ur rat i cry about ivy and shes been gone for a year its best for me to get another rat cuz its makes me think about the new rat and not the well ( old ) rat i know that sounds mean but it really does help IM SOOOOOOOOOOOOOOOOO SORRY Rats are the best friends anyone could have Good Luck