Porn addict boyfriend obsessed with manager and ex

I used my 26 boyfriend's phone to locate mine. When I opened the phone I discovered two searches. he typed in Google that he was looking for help to "manage his attraction to his ex" and the other "wanting to have sex with my manager despite being in a relationship should I do it?".

I confronted my boyfriend about it and he revealed to me that he went on his ex's Instagram page twice and each time in the moment of looking through her page he was wishing he could f\*\*\*k her and was reliving having sex with her. As for the manager (who is also younger than me) he's had a crush on her for months but was allegedly never going to actually cheat on me with her. He's also looked up his managers Instagram page several times to enjoy looking at her body. I also believe because of his porn addiction he masturbates to her. but I'm not sure

I was very hurt and I cried about all of this information.but mainly about His ex. she was abusive so it makes the whole fact that he's still obsessed with her even more traumatizing for me. We have been together for 2 years and 2 months.

I understand if she was a good person at least but I personally would never be caught up wanting to have sex with someone again who was so abusive to me like she was to him. is this something that a man can ever really get over? No longer looking up their ex and wishing they were having sex with them when they see their pictures? I don't expect him to never think of her every now and than or never have a sex fantasy. But the obsession of her? Or should I just cut my losses?