i have a fairly strong crush on one of my good friends but the problem is she's already in a very steady, healthy relationship with one of my other good friends. they've been together for almost a year now and i can tell they're really happy and well-matched with each other. recently they exchanged promise rings so it's pretty serious and they're definitely headed for the long-term.
not that long ago my crush's girlfriend told me that my crush used to like me sometime in the academic year 2014/15. before that i'd kinda had suspicions that she had, or maybe that she even still liked me a bit at the beginning of their relationship. in march/april time this year i started seeing another girl who would often get jealous of the friendship i had with my current crush, telling me 'she blatantly likes u' which i dismissed, obviously not interested anyway as we were both in relationships at the time. there were also a few occasions where things would be implied by her. this one time i was outside for lunch with her and her gf plus a few other friends of ours and i accidentally called one of our other friends by my crush's name. as a joke, we then continued the conversation with swapped names and mine was swapped with her girlfriend's. her gf then said to her 'i know u've always wanted to f**k [my name]', to which she answered 'yep' without hesitation. i said 'good thing i'm [her gf's name] then hahaha!!' and the conversation moved on. she also seemed kinda sad when she found out i was seeing the girl i got with in march/april? maybe that's just bc they didn't really get along though.
i miss her so much recently because we're at different colleges now and i see her very sporadically. even when i do see her we're rarely alone and we don't get to talk like we used to. a couple of weeks ago we did end up having a good conversation and she said she missed talking to me and worried if i was okay three or four times a week. it was so lovely and it reminded me of how happy she makes me.
but all of this is irrelevant anyway really because i know that even if they did break up we could never be together bc that would mean sacrificing my friendship with her girlfriend ((especially bc i know she would be profoundly affected by their split as she's quite an emotionally intense person and i can see she really loves her)) and i love her and value our friendship too much to ever do that to her. this goes without saying considering the above, but i have no intention of interfering in their relationship either - their happiness is ultimately the most important thing.
even though i wasn't close with either her or her gf until they got together it's difficult thinking what might've been. i thought that if i just ignored my feelings they would eventually subside but it's been months now and i still think about her every day and hope she'll text.
any advice on ways to get over her and move on?