i need help!

I just need to vent 😔 me and my fiances relationship has been rocky for a while, here recently he has been diagnosed with some health problems and it has put stress on both of us and made things worse. I honestly feel like we are more roomates than lovers. We hardly ever have sex and we argue a lot! He finally admitted to me today that sometimes he feels like the spark between us is gone, which i agree, and he asked what we could do about it. Sometimes i feel like it would be best for us to go our own ways, and other times i feel like i couldnt live without him. Any of you have any ideas on how to get that spark back? Or would it be best for us to go our own ways?