I think question 1 Sophie has to be what do you really want the outcome of this to be? That you get back together and sort out your problems, or just to be rid of him. Once you know what your objective is, then you can work a little more calmly towards it.
At the moment , as the others have said, you are giveing him some mixed messages, and it sounds like you don't really know what message you want to send really. Take overnight to think about it and get clear if you think the relationship is saveable or not and hopefully you can both approach it more rationally.
We can't tell you what to do, or if his family are interfering, the only real advice is to try and think carefully before it reaches a stage where nobody has control of the situation any more, which it sounds as if it is approaching.
Good luck and best wishes for getting it sorted.