<human>: Can you provide a brief rundown of the text in within 3 sentences?

Together 3 years.

Over the past couple of months, my boyfriend has been increasingly open with his porn, always talking about porn stars with his friends and saying "my coworker influenced me to be this way". I have no problem with him watching porn or talking about porn stars, however, last night, in a skype chat of 21 people, him and his friends sent links to porn stars and instagrams with pretty girl and big boobs, which I'm okay with, but later on, they created a separate chat and my boyfriend and my boyfriend only, sent them all videos of girls masturbating and his favourite porn websites, including his favourite videos. Along with that, he screenshotted and sent them parts of the video that he thought was hot. I'm very disgusted by this and frankly, i'm disappointed in him for thinking that this is okay for him to do especially since he's the only one in a committed relationship. I confronted him about it and he tried justifying it by saying "I was just joking" or "why can't I send my friends porn?". I'm absolutely not okay with this. I always thought that my boyfriend had a limit. I never thought he would be THAT guy who openly shares his porn with the whole world. I'm disgusted and disappointed by him.

Is this normal behaviour for an 18 year old boy ? Is it normal for guys this age to send porn videos to his friend and openly share when they're going to masturbate ? Am I overreacting ?
<bot>: boyfriend of 3 years is very open about his porn now and sent porn videos to a group of our friends. I'm disgusted by it. Is this normal behaviour at this age ? Am I overreacting ?