@cora sorry you are not receiving the support you need from your partner. Only you know if his behaviour is a one off out of character or repeat occurrence with many excuses for each time. Put your needs first. Push away any flickers of guilt you may have been experiencing. You deserve to be taken care off.
You don't say what state or suburb you are in on your profile. Touch base with your council or community centre for home help / district nursing. If you are still in hospital the hospital social worker may be able to helpyou. Reach out to your breast care nurse as well.
Sending you positive thoughts. Be brave. Don't put up with any shit.