Unbiased opinions/Help

Backstory: I raised my daughter as a single mother her first 6 1/2 years of life. Her father and I split when she was a baby. He has been pretty scarce since then. I met a wonderful man when she was 6 1/2 (We are now engaged and she is now 12 1/2) a couple years ago she caught my now fiancé standing at her bedroom door watching her sleep. She’s never experienced a dad before so it kind of freaked her out. She said she noticed it happen a couple times. He stopped when I addressed it and let him know that even without poor intentions, it wasn’t something she was comfortable with. Never went in the room (to clear that up, he’s not some perv) but nonetheless it wasn’t something she felt comfortable about…. then things since the past couple years have been great. That man has never missed a moment with her, from school achievements to every single soccer game, taking her for extra soccer practice. He knew nothing about the sport but I’ve seen him researching things about it so he could help her practice. She loved having a soccer ball buddy outside of regular practices. She, on her own, goes up to him just about every single night and gives hugs and good nights etc… these past couple weeks have been rough. (We are due to get married in September) She is now expressing that she does not want him around or in her life, she does not love him or like him, and is saying she thinks he’s a creep because of those times of him watching her sleep. I honestly never thought much of that when it happened because as a parent I too catch myself just watching her sleep. He deep down views her as his. As her biological father is very few and far between, he did what her father wouldn’t do. I’ve never had behavioral issues with her, aside from the typical middle school drama that I may not survive 🙃 He has now been very depressed for a few weeks now because he feels she doesn’t want him in the picture. And he overheard her express that to me so it solidified his feelings. I have one person in one ear (fiance) expressing feelings I didn’t know was possible (he’s a very closed off person normally when things bother him) and feeling like it’s best to just walk away (or worse) before he ruins her life and like he has failed as a father and another person in my ear (daughter) saying her feelings don’t matter and she hates him and wants him gone but doesn’t want me to be unhappy because of her.

I don’t know what to do.