Long relationship about to end - need advice

Disclaimer: This post is rather long, sorry! I could really use some help though so thanks to those who read it. My 8 year relationship with my girlfriend is close to coming to an end I believe and I'm looking for some advice to whether it's worth trying to save or not. Basically I feel like I have lost all romantic feelings for her and I have little to no interest in sex with her. I still care a lot about her in the sense that I would do anything for her, just not in any romantic way. She still cares about me a lot in a romantic way and says that not being with me is unthinkable to her. I know me being very cold to her must be extremely difficult to deal with and I feel terrible about it but don't know what I can do. I feel like we have grown apart since we met. Since that time, my entire outlook on life has changed. We have moved to a different part of the country and I'm living a completely different lifestyle than I did before. I used to just go through the motions of life without any real goals other than to just make money and advance my career. I feel like I have "grown up" and realized what is important in life to me and what I want to do with my life and have made huge changes. She has come with me but still has the same view on life as she did when we met and there is nothing wrong with the way she views life but I feel that we're no longer compatible. We have almost none of the same interests anymore. I know this is likely my problem as it's not the first time this has happened to me. My previous girlfriend and I had the same problem where it was great for about a year but then I lost all feelings for her as well. With my current girlfriend it was also great for a year or two but since then it has not been a very good relationship and I often feel like it should have ended a long time ago. I'm sure part of this is because I have some psychological disorders. I have social anxiety, can be very selfish and often times do not care about things that "normal" people care about. I have seen a psychologist and been on medication but nothing has helped and I have sort of accepted that this is the way I am. I'm a very rational person and think things through in a very logical way and part of me thinks this is just a normal thing to happen where we are genetically programmed to grow "bored" of a partner and that staying with someone for the rest of your life is trying to fight natural instinct. It also seems to me that if you have changed so much that you no longer share almost any interests, it doesn't make sense to stay together. I feel like your partner should also be your best friend that you can do things that you enjoy in life together and that those things are what makes up a relationship. My girlfriend does try to push herself to like the things I do but I know that she doesn't really enjoy them and only do it because she thinks I want her to, which I do but only if she herself enjoys them. That said, she is an amazing person, very kind, thoughtful and beautiful. I feel like the only reason we stay together is because we have a lot of history together and that alone isn't enough for me. Part of me wants to end this relationship and move on as I think it would be best for both of us. I think she would be much happier with someone that shares her interests and views on life. Another part of me is terrified of not being with her and worried I will regret it if it does end. I'd be happy for any advice anyone can give us, whether it's direct advice or if you think we should go to some kind of counseling together.

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