I might be married by habit and repute
It is notoriously difficult to prove such a marriage, particularly these days when it is no longer considered scandalous to live together.
It is not just a matter of time together, everyone must think you are actually married. It is beyond the scope of a website dealing with simple situations and simple Wills to help.
If you think you are in this situation you need to see a Solicitor.
My affairs are complicated
Generally having a Will is better than having no Will so make a Will here by all means but bear in mind that whilst this website can prepare a Will for the majority if your life is complicated, in ways not explored in this Will-making process, you would be well to play safe and to see a Solicitor.