Are good days mixed with bad?

I have been porn free since mid February, and have been having sex regularly with my girlfriend and occasionally masturbating still like maybe once every two weeks, and my question is are good days mixed with the bad? We attempted to have sex today an I was incredibly turned on as I have been since I quit watching porn, but I lost my erection in the middle of it all and it has caused me a lot of distress that maybe I'm just this way forever
 
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