Should I tell her I love her?

Im in love with my best friend. She makes me feel amazing. She makes me happy. When we first became friends we tried to date but unfortunately she wasn't ready because she had just gotten out of a serious relationship. But now she has moved on and she has started dating a guy and it tears me apart. Should i tell her I love her? Would it help me move on if i express how i feel even if it changes nothing? Im not trying to convince her to leave her new man but i do feel like what i say can make a difference. And maybe getting it off my chest can make it easier for me to let go and move on. What do y'all think? Please Help
Should I tell her I love her?
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