<human>: Bit of backstory about my own fuckups. I am a bit of a sex addict, and a pornography addict. While I stopped watching explicit 'internet porn', I developed a different fetish, which was to use photos shared by my friends on social media for my arousal.

I've been dating her (F) for just over a year now. She had a very sheltered upbringing here (we're not American), and had never dated a boy before. But within the first two months, our sexual chemistry was in sync as well.

Thing is, I continued to masturbate a lot in my private time. She walked in on this about three months ago, saw the photos of a mutual friend on the screen, and I came clean. She had initial trust issues of whether I wanted to cheat on her, but I managed to explain myself and exactly what it is I do.

Somehow I ended up with a girlfriend who would have sex with me, and then pleasure me while I looked at photos of other girls later. I'll be frank, it's amazing for me, but I've just realised I've been excessively selfish the past few months.

What I thought were her making gradual changes to her diet and just changing up to be healthy, is slowly seeming like an eating disorder to me (she's not overweight, I thought she was trying to pack on muscle and do something like leangains that I follow)

She makes off-hand comparisons to these other girls all the time ("my hair's even longer than X's now, you like?" "If I put this profile picture up like Y's pose, I'm sure a lot of people are going to like it" "I'm just trying to fit into that dress we saw Z in that day")

I can't seem to think about anything other than myself. I'm hurting my girlfriend in ways I don't fully appreciate, am I not? I'd love somebody to just objectively tell me what they make of this.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: girlfriend helps me masturbate to photos of our friends, I have so far assumed she's kinky that way, but I could I actually be causing her harm?