My girlfriend (22) watches a lot of porn, and it really bothers me (23).

I'm feeling really concerned about something in my relationship. My girlfriend tends to watch porn and pleasure herself when I'm asleep during our sleepovers, whether at each other's houses or over the phone. I'll notice she's muted herself, and when I ask what she's doing, she ignores me and continues for about an hour before falling asleep afterward. We've been together for two years and are planning to get married soon, and I desperately want her. She says I'm very attractive, loves my body, and enjoys my vibe. However, even when we're in bed together, she often says she isn't in the mood for intimacy, yet later on, she seems to be engaging with porn when I'm not aware. It really bothers me and makes me feel insecure about myself. I don't watch porn or pleasure myself at all; I just want to be with her. While she watches porn around 7 to 10 times a week, she claims she isn't horny when I suggest we get intimate. Interestingly, she said she would be bothered if I watched porn or did anything like that, so she appreciates that I don't. After discussing this with her, I was open and kind. I told her that knowing she engages in this behavior upsets me and asked why she wouldn't prefer to share that experience with me instead. Sometimes she apologizes and says she doesn't want to hurt me, but other times she suggests I should find someone else if I can't handle it. I truly love her; she's my dream girl and the love of my life, but feeling this way makes me very sad. Does anyone have advice on how I can cope with this situation? TL;DR