I've been in co-dependent relationships before - being the dependent and the dependee - and they are not something I wish to include in my life any more.
I do have a support group for my issues with relationships. I will make more effort to attend meetings and contact people from there and see how I go.
I see a lot of sense in what you're saying, and I have been thinking that it might come to that, but I want to keep trying at this stage. Thank you, again, though for your words.