He sleeps in the same bed
Ge pays fir her exams
He lives with her.

And then he says he tried to break up…but he cant. Im really sorry, but I smell a two timing rat. He is in bed with his girlfriend – and you believe they are not intimate ? I understand why its easier to believe him. But use common sense. The liklihood is, that he is in fact in a real relationship with her.

And as you say – you are currently the ‘other woman’. This will not end well. Try to be realistic. If you walk away, you will see in time what happens. If he does become single he might follow you. But currently he is eating 2 cakes !!