You say you still haven't saved the relationship, you say you have a hard time accepting this reality, you say that after separation, you don't know how to start living again. Does it hurt? Pain is right because pain is a symbol of wound healing and a necessary process of growth. Sometimes I have to admit that love is a particularly fragile existence, and those feelings that you once thought were as strong as steel, do not know when they will break up and eventually disappear.
The more you grow up, the more you will feel that in fact, feelings and people are not very able to resist tossing. Then you will understand that when a relationship really can't last, even if you don't give up, you must say goodbye. In fact, I think that the biggest connection between lovers is love, and without love, there is no tolerance and companionship. Since you believed it when he said he loved you, then when he said he didn't love you, don't deny it and be entangled. You have to know that as long as one person is not in love, those two people will not last long under any circumstances. The days ahead are still very long, and no one should delay anyone.
One day, you will slowly learn to calmly accept everyone's arrival and departure, learn to accept the consolidation and collapse of every feeling. Love can really turn people into birds of prey, and caution and insecurity are sometimes a precursor to loss. So don't put all your energy on love, lest it disappear and you will lose everything.
Even if you love someone again, you should not forget to leave a trace of sanity. Because life is not only poetry and far away, but also the impermanent feelings of the impermanent years. Letting go of it does not mean that the love is not deep enough, but you should be thankful that when you love others, you still have not forgotten to love yourself.