Boyfriend masturbates to Instagram girls he knows after seeing how much it hurt me and the relationship should I dump him?

Soo I’ve been with my boyfriend since 8 Months and he is wonderful and he is always there for me and supports me and loves me a lot. Everything is perfekt, except that he jerks off to girls he knew and had a thing for. Bevor we were exclusive he texted with a lot of girls and tinderd behind my back. Shortly after we became a couple I found it all out. It was completely excessive because he a a folder either over 600 pics of girls form Instagram out of berlin, where we both live. All pretty average not like models or so. He defiantly stopped texting or dming girls after we were exclusive but he just gives in to is sexual side. Over the past 8 months I would catch him lying about looking at girls profiles like 8 times a day. And he saw how much it hurt me and promised to stop or at least tell the truth. But he didn’t... And he admitted that he jerks off to their profiles and imagines sex with them. It’s crazy because he remembers these girls names from like years ago Or like a random tinder match he couldn’t finde her name on Instagram so he looked it up on Facebook. I just don’t get it because our sex life is really great and I send him dirty pics a lot. And from a neutral Perspektive we both say these girls are like fives and I’m a ten. It doesn’t make any sense. And he constantly lies about it and doesn’t see he’s addicted of his single life habits. I mean it’s about time to drop that since we are together for a long time now. I am 100% sure of his love but it’s just really hurts my feelings how he can enjoy something where he knows it will destroy our relationship and hurt me so bad. 4 months ago he even had a nasty face account he lied about and even looked at these girls when my dad was visiting and my boyfriend had to “work” I personally think he has some sort of addiction since he is phone addicted. But yeah I don’t know is this normal behavior And what should I do?
Boyfriend masturbates to Instagram girls he knows after seeing how much it hurt me and the relationship should I dump him?
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