I honestly think I’m done....

Me and my SO have been together for 2.5 years. Everything has not been all bad, but things haven’t been all great either. We both have our times where we just get tired of the other, but I honestly feel like I’m done. I can no longer see the good in this man. We both have done and said things to the other to try and hurt the other worse, but now I feel like this relationship is pointless. We do have a 1 year old together and I have a 6 year old from a previous relationship. He’s a wonderful father, but I no longer feel that connection with him. I wanna leave but at the same time I don’t wanna feel at though I’m giving up. I’ve expressed to him on multiple occasions how I feel, but he doesn’t get it. I feel like I can no longer fight by myself. I’m stuck on what to do but I don’t think my heart is in it anymore. Advice please !!