Letter 5 of 5 from 1919/The End (In More Ways Than 1?)

This one has no envelope. I'm curious if Marjorie threw out the envelope, and I'm curious as to why she kept these particular letters (were there more? What happens next? Can I ever know? What is this little musical piece, and what happened to make things turn out like this? Where is he writing this, and who died?)
In this one it's written quickly, likely out of distress. It was also folded more sharply. Also, it's in pencil, not pen.

G.R.M.
12/2/19
My Dear good Marjorie
I received your letter O.K. I don't understand why you should write so hard to me I am very sorry you understand the matter that way. and in your letter say things that would make others think Im the one big (????) I may be am don't you know-- honey it takes more than one to (?)lay as we have. I too have had time to think these things over but it may be hard for you to read this but you made me what I am today you said I should be ashamed (?) am Paulie and have been for some long time. but you will not understand well Marjorie I will have to cut this kind of writing out love the more I write the more my heart turns into lead [lead is underlined]. I don't how I'll look [erased] into your big Brown eyes that have said so much to me
I don't know anything to write that will interest you very much seeing your feeling so blue. Im sorry you feel that way girlie you may never know where Im writing This letter.
Last night I went to the South High School I will tell you what for if you [interruption at top of new page, saying The 3rd Rail] will ask me some day
Paulie before Today days did seem like weeks but when I received a letter that I so long have been waiting for I dont care what becomes of me it would have been better if I had died [died is underlined] in place of (??????) (??????) boy so much to live for and me a good for nothing and a no good there honey I feel better now I know you love me yet do you not honey sure you do. right now Im I'm lonesome for you Dear Marjorie so lonesome I'm sick [he writes then (turn over) as he rarely goes over a full page-- oh, and there is a short musical piece in there] Oh honey I cannot wait any longer come back to old G. R. and me bring back the sunshine you went away with [then, all underlined, he writes in neater hand, I love you Margg I do] and honey girl will you forgive me for all I've done would to goodness I could hear you say yes. well good night Paulie it is after 10 and I must go home yet if I can
I hope this letter will give you satisfactory + easier (?)eeting)
now don't forget Paulie I remain your True Friend Leonard and (?????) (??) (????) love and kisses honey [many x's, a flag of x's, a musical score I do not understand, and) hope to come Sunday morning.