So, there is not much difference between live-in and marriage. The question is one: Why do you need a partner? You need to ask that to yourself. Secondly, if you indeed do need a partner, are you with the wrong person, or are you with the right person?
If you discover that you really do need the presence of somebody in your life, first of all, the reasons must be very-very clear.
You cannot just blindly go about inviting somebody into your very-very personal, inner space.
The reason has to be absolutely clear.