Why can't I move on from my ex who cheated on me even though I wanna move on when he comes back I can't simply reject him and I always forgive him?

It's hard for me not to forgive him or reject him because he's everything to me and I can't imagine myself being with another guy other guy. I got attached to his love and I feel very depressing if I forcefully try to stop myself from loving him or if I don't forgive him or reject him

Why can't I move on from my ex who cheated on me even though I wanna move on when he comes back I can't simply reject him and I always forgive him?
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