@absolutereality replied to your post “Was Marianne the first one who got attracted? and it was that Spinet...”
Maybe I'm projecting my own little gay self on Marianne here....but I think she's attracted to Heloise from the beginning. This isn't a new feeling for her I think, so she is able to compartmentalize it. Until, that is, Heloise starts showing interest (see "I felt your absense" and "she talks about you.") After these scenes the camera cuts to Marianne and she has the ultimate oh shit face.
This seems like genuine lesbian experience Celine would have been trying to portray. As a lesbian today (or in the past), you repress your feelings until this small miracle happens and the other women turns out to also be attracted to you lol.
My very tired eyes just transmitted these words to my tired brain--”Portrait of a Lady on Fire not only understands the depths of first love, but also the yearning and repressed desire that comes with love that has so often been considered unworthy or illegitimate.“--and combined with what you just said, I simply have to smile.
I mean, Céline very purposefully leaves a lot open so that you can fill in the experience you yourself need to have/see. She isn’t very specific about the details of Marianne’s past (or Heloise’s) so that pretty much any reading is valid. All we know is that Marianne has definitely had at least one sexual affair, with a man, but that doesn’t mean she hasn’t also experienced desire for women and/or had a roll in the hay with a woman. There’s markedly no gay panic (or same-sex-attraction-motivated hesitation) in the film and so I know many of us are gonna fill in the details: Marianne (and possibly Heloise) has had prior brushes with same-sex attraction. (To be able to identify what they’re feeling, to act on that attraction without much hesitation...)
But I love how you talk about it here, that Marianne doesn’t give herself permission to contemplate/unleash/fan her feelings, so to speak, until she realizes there’s a chance for mutual reciprocation. It’s like Céline said at the Collider FYC Q&A, that when we’re falling for someone inside we’re so impatient and hoping it’s mutual but we have to grant the other person time to... signal their interest? give consent? And this does feel especially true for wlw situations where you can’t always tell if another woman is into women and so you always want to respect boundaries and not come off as predatory.