why am i happy that she DOES NOT feel the same way and is only doing all this for remi
There's nothing wrong with that though. As Remilia's only true source of innocent affection and kindness was Remi, Remilia bases her own moral compass on Remi's perspective. She has accepted her own evilness, so the same way that she started doing good things because she wanted Remi not to have a bad rep, she also decides the rest of things that way. Everything that Remi would do is good, everything she wouldn't do is bad. Conversely, everything that would make Remi happy is good and everything that would make her sad is bad. Remilia never chooses for herself because, under this black and white world order she's created, she's convinced good things shouldn't come to her because she is not "good" like Remi. But everything good should come to Remi. Even her own body and life should be Remi's if she wanted to. Choosing Angel "for Remi" is the equivalent of her accepting that he's everything good. Ironic really, since Angel never knew Remi and all he knows is the Remilia that has chosen to act like Remi would have wanted, but she is still very much Remilia. She doesn't try to impersonate Remi. It's a very complex attitude, but that doesn't mean she doesn't actually love him or like him.
i would kms if i was haesoo