Please give me an explanation

What you will never understand about me
is how mush I truly love you.
but what I don't understand is why?!
you make me feel like you don't even care.
you said that this time around would be different,
you said you made a big mistake leaving me the last time
but your actions and words prove otherwise.
how can you look me in the eyes and lie
about something that means so much to me
but apparently means absolutely nothing to you.
i cant believe Ive done so much for you.
after you've been nothing but a jerk to me
why the hell do i put my self through this
just to have the reassurance that someones there.
when you aren't ever there?
I'm tired of all the lies, I'm sick of your puppy dog eyes begging me to forgive you
for everything you've done wrong.
all you worry about is your weed for your bong
its pretty messed up you take drugs over true love.
being retarded and not knowing whats going on for two or three hours
how could you do this to me.
do you not have any feelings at all
or did that start to fall from your addiction?
please give me and explanation!