Torn Between Two Loves: Should I Marry My Long-Term Boyfriend or the Man I Met Recently?

This is an urgent situation and is really difficult to explain what I am going through and my words might not completely bring that out but a piece of advice/perception might be really helpful. I am 30 years old. I have a long term boyfriend(started dating in 2012). He was the world to me till almost 2020. He was my family, my everything. I too meant the world to him. We treated each other like "I am his and he is mine". Such was the commitment and care. We never thought we could even think of marrying some one else. We are in long distance since 2017. Used to meet once in every 2 months sort of. In 2021, I met some one else and started going out with him as we were in the same city just casually believing that nothing serious has to happen between us and that I "obviously" will marry my long term boyfriend undoubtedly. But things drastically changed. I developed strong feelings for this person and met more frequently. I went with the flow despite having immense guilt that things will eventually get very complicated and all the three of us will be hurt. But I never gathered the courage to break ties with this new person as the bonding was very maturely strong between us. Nor I could break ties with my long term boyfriend as he still was "my family" and he was the only one I resorted to whenever I needed someone. The new guy belongs to a caste my family will never agree and because of this I persuaded the marriage talks with my family for my long term boyfriend. My family agreed and my marriage date is scheduled in end of November 2024. But I everyday am in dilemma as to whether should I marry my long term boyfriend as scheduled or should I take a bold step of breaking it and going for the guy I met in 2021. I told my mother about the situation but she said my father will never agree for this new guy's caste and that its too late and I should marry as scheduled. I am not able to take a decision and going with the flow and probably will get married with this dual thought and uncertainty. I have thought a lot about this, about how my life will be with both of them, but its very difficult for me to break things with my long term boyfriend even though I have no romantic feelings for him from the past 3 years. There is 0 intimacy, neither emotional nor physical. But I do care for him. I do want him in my life, whether as a husband or otherwise. I feel the way he takes care of me and thinks about me, no one else will. But the thing is I don't actually "feel" for him anything, nor do I miss him as much, we don't talk the way we used to , there's a detachment. We are in long distance and are in such different fields that we never probably will live closer location wise. There's financial disparity. I earn almost thrice as him but we probably are okay with this. We both are aware of all these problems and are still ready to marry with the "hope" that things will eventually be okay. On the other hand, the guy I met in 2021- he has a good career and location wise, we are in long distance too but way better placed and in near future, his job location might be very flexible. He earns more but has huge family obligations as his family including his two brothers are not very well off. I have probably made peace with it when I thought about considering him for marriage. I love him and we have great emotional intimacy . I feel so calm and happy around him. It's like a festival when he is around me. He too loves me a lot and is ready to take efforts to make our marriage possible given the family and caste differences. I am really very disturbed and unable to decide whether I should break the marriage as if things don't improve after marriage, I will regret it always. Preparations have started slightly and it would be a big step now. Should I just forget about the 2021 guy and marry my long term boyfriend in November hoping that things will fall in place..or.. What should I do! My long term boyfriend has also lost feelings for me but he still cares for me and he says if we work for our relationship, things will be good post marriage