Dear dijadei,

I think first of all because you´re unsure about your relationship you´re starting to have doubts about yourself – even trying to change yourself. The fact is he fell in love with you the way you were – so there´s no need to change who you are just to keep him with you (it´s also not honest to yourself).
You´ve changed your attitude and that´s why he became unsure and insecure as well.I´m not excusing him lying to you or hiding things from you here. There´s the reason why you changed but you should also ask yourself why am i so scared? Did you have relationships before? Then you should know even if this one doesn’t work out (i know it sounds harsh) the next one just might if i learn from this.
For yourself first and foremost you need to keep your anxiety in check. Secondly like anita suggested have a good calm talk with him. If he doesn’t want to be with you then you have to accept that and move on. You´re smart and beautiful and your should never have to convince anyone of that.
Yes you made mistakes but so did he. Either you both work things out if you think it´s worth it – or you both move on.