Starting a new life on my own

Sorry if this comes across as brutal, but I think someone has to say it:

I don't think anyone will finance your separation, cancer or no cancer. Have you thought of trying counselling?

And I really don't think "my best mate says so" is an argument you should be using. This is all down to you and what you feel.

What you need is to find someone who can point you in the right direction for making the move - if you are sure that is what you want.  So speaking to a professional counsellor - whether on your own or with your partner is a start.  If you are sure you want to move then go for it.  If you have a Maggie's Cancer Centre near you you can contact them for benefits advice - if you are eligible for help - I have done this for my sister via e mail to a Maggie's benefits advice specialist.  Other Cancer charities such as Tenovus and I am sure others offer advice. 

How do you share your accommodation expenses at the moment ie do you own the accommodation between you or do you rent and if so in whose name  as this can make a difference. You can also approach the local council to be put on a waiting list for suitable accommodation though this may take quite a while before you get something depending on the situation in your area.    Citizens Advice may also be able to help you sort out the practicalities there find your nearest citizens advice centre and make an appointment to see them.  In the mean time if you are desperate to get out maybe you could approach family or friends as a temporary measure until you can find yourself a suitable place.

All the best.