Bought my gf a dildo to spice up our sex life… now she’s addicted and it’s changed everything. Oops

My 24f gf and I started using a vibrator during sex recently, which was fun and really increased her pleasure. This gave me the idea to incorporate other toys, namely dildos which i thought would be hot to see her use. I also thought it would be hot if it was bigger than me. I ordered her a well reviewed large size one. When it came in the mail it was bigger than i expected… 9” and very thick. I was hesitant about it but still decided to gift it to her. She was surprised at the gift but not opposed to trying it. I think our recent adventure into the toy fun (also watching some porn together) opened her mind. Anyway, the first time we used it i helped her and it was so exciting. She was struggling with the size, and basically only used the tip. Still, I could see how much pleasure it was giving her and it didn’t take long before see was shaking and cumming on it. This was really hot to see, but I didn’t realize the pandora’s box I opened for her. Eventually we graduated to using both the dildo and vibrator at the same time time… her orgasms were crazy and it was so fun. Flash forward 2 months to today. We hardly have real sex anymore because all she wants is the dildo. She went from only fitting the tip to now easily taking all of it right down to the base. We use it most nights, and she now uses it on her own to masturbate with porn more and more often. I hoped it would spice up the bedroom, and it did… but I feel like I’m now being cucked by plastic. When we do have real sex, she feels so different because it stretched her out a crazy amount. She hardly enjoys real sex with me anymore. I might have made a huge mistake.