When u want someone who doesn't want u

Michele
Girls, I was seeing someone for one year, only sex, once per month when he used to send message. When I asked him about serious relationship he said he likes to be single, and that he wasn't over his ex yet. Now he is dealing with a depression and his dad is with cancer and I have no idea how to help or if I should be closer even if he just see me as a casual thing. I love that man, wanted him to be my bf and husband one day but I can't force a situation. What u guys advice me?