Failed again and lack of motivation

Guys, I was on a 40 days streak without masturbation and 4 days streak without watching porn (during these 40 days I’ve never touched myself while watching porn).
Today I’ve masturbated.
Why I did a lot fatigue to have an erection?
First time I relapsed with my penis puffy but not hard at all (was like 5.8 inches… that’s not even my best size), second and third time I masturbated, because I couldn’t believe that I was cumming whit my penis like this (I did it mainly for personal pride) but my penis didn’t get hard above 5.9/6.0…
Fourth and last time of today, finally my penis got the normal erection at 6.7 inches, but when I relapsed it was hurting me… (Maybe for too much masturbation). So why the penis do hardly get to his normal erection after 40 days without touching it at all? Is there a scientific research that could explain this?

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