ED is it because of my porn addiction

Im 29 bro ..I have always masturbated using porn . With most guys do. I have never had a problem with it until just about 2 mths ago . I would watch it for 2 hrs when masturbating. I stay erect the whole time during masturbation . But as of late i can get one but will not last with my female friends. I really believe it from to much porn and my penis is kinda dumb to the pleasure. unless its from me. I have had the same girlfriend for 10 years. I have never had a problem with getting one with her. But I started to talk to a new girl and i cant perform for her at all. Even been having erection problems with my girlfriend lately .. Im going stop watching so much porn and less masturbation .