Hello. I believe I can be of help to you with this issue.
You are 23 and are quite smart intellectually, but I'm afraid you are also viewing this situation from a much more emotional perspective than a wise, rational perspective. I think your emotional trains of thought try to reassure you that whatever is going on can be resolved or might get better on its own over time; you rehearse his reassuring WORDS that he loves you and finds you sexy.
HOWEVER, your wise rational mind believes that he has a pornography PROBLEM; it is starting to tell you the cold hard, literal fact that he prefers masturbating to porn videos and pictures much more than he likes having sex with you. It also says that his porn viewing is literally stealing intimacy away from your relationship. He is vicariously having sex with the women in the porn videos i.e., his imagery, imagination is much more focused on the fantasies of having sex with them than with you. So your wise rational mind should be telling you that this is a form of emotional 'cheating' or an emotional affair, because he is preferring to spend his time in imagined sexual involvement with these other women in the videos. This is what this all 'literally' means. Your wise rational mind is also telling you something important: HIS WORDS MEAN NOTHING< HIS ACTIONS MEAN EVERYTHING. So what should you believe? You are smart if you believe his actions communicate, and you literally ignore his reassurances, his words, etc.
So these are the facts of the situation. You need to decide if you want to take some ACTION on your own, rather than talk to him, try to extract more promises, reassurances etc., ('words') etc. You are only 23 and there are almost surely dozens of guys who would climb mountains to have an exclusive relationship with YOU, and would prefer YOU over having vicarious sex with female porn stars. Your emotional mind and trains of thought don't want to face this fact, but your wise rational mind probably says it is time to give your boyfriend an ultimatum---eliminate the porn, get into couples counseling with me to build our relationship; " yes dear, you are tired and stressed from your job but you THEN cope with your stress
and unwind by having these emotional affairs with women in porn videos, rather than spend time with me; this is what you prefer. I don't want to hear reassuring words or promises but I do need to see permanent behavior changes or I want out of this relationship. I didn't sign on to compete with porn videos when I made up my mind to be true and faithful in a relationship with you. If I had known you really preferred spending your time with porn than intimate time with me when I met you, I would have 'walked'."
This is quite a common problem with many guys but frankly, women cannot solve it or fix it or change their behavior to get the guy to change. This really is a significant problem and it is HIS problem.
What do you think?