Is it ok for your SO think of past sexual experiences as maturation material?

I made the mistake of asking my bf what he thinks about when he masturbates, he answered honestly and without hesitation: women whom he’s had sex with. I couldn’t believe my ears. I’m shocked, hurt and confused all that the same time. I wouldn’t mind if it were abstract fantasies with strangers or even porn, but recreating mental imagery of past experiences? He says that all men do it and I’m just being naïve. Is this a red flag? (side note; he doesn’t watch porn b/c he’s a recovering addict). Anyway, I cant help but feeling insecure that our sex life (or me) is just is not cutting it for him.

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