(27M) (24F) (27F) My sister is extremely negative and unsupportive towards my 4 year long, long-distance relationship with my girlfriend, causing a rift between me and my sister, whilst also making my girlfriend not want anything to do with her. How do I salvage my friendship with my sister?

To keep things brief. My (27M) sister (24F) and I used to be close and great friends to each other. However 4 years ago i found myself in a long distance relationship with my now girlfriend (27F) who i had met online, and what started as basic concerns from my sister, turned into unfounded criticisms and almost prejudice like feelings from her towards the whole idea. I have been through many conversations with her to try help her see things from my perspective but im at my wits end, im almost ready to just throw in the towel and just accept things will never improve with my sister.
the general thoughts always amount to that because im "always" on a call with my girlfriend, im not experiencing life (despite having great new life experiences travelling to a new country because of said long distance relationship). Im spending too much time waiting for my life to begin because we arent together physically. It always comes down to the fact that basically me and my sister dont get to hang out much anymore, despite of course still having chances to hangout, it just never is enough it seems. But at some point as life moves on this was always going to happen as we find our own paths in life. I just dont understand why she cant accept this, despite the multitude of discussions on the subject, which usually just leads to her guilt tripping me, saying things and then immediatly saying thats not what she meant whilst again attacking my life as some sort horrible choice. It honestly leaves me dissappointed thats she isnt supportive or happy for me, but im also a little weirded out by her obsession with me and MY relationship.
Honestly typing this out so far has made me feel even more weirded out by the situation, my sister really has no right to be acting out like this, and i shouldnt have to keep explaining myself to her, and yet it keeps happening. Obviously, im extremely happy with my long distance relationship and are in fact in the final stages of closing the gap permanently, of course, she isnt happy about that either.
This whole thing makes it difficult for my girlfriend to want anything to do with my sister of course, and the only reason it bothers me so much is i dont have much family left, only my mother and my sister as we lost our father 4 and half years ago. So i would like to somehow salvage my friendship with my sister but it just seems so pointlessly and weirdly ruined by this. Any advice on how to go about this, or if it seems like a lost cause.
TL;DR used to be good friends with my sister until 4 years i got into a long-distance relationship with my current partner. Now sister is vocally negative, unsupportive and constantly upset by this "life choice" of mine.


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