He needs to accept you for who you are and that includes your illness. As far as his interactions with other girls - the circumstances and frequency of such contact is something that you two need to negotiate so it is "OK" for your relationship.

Try not to obsess over what he may or may not be thinking about his ex, etc. You can't know for sure and none of us are "mind-readers."

I think that guys and girls have different modes of communication and levels of wanting to share. I think that you may be overwhelming him by sharing how distressing it is for you and you are overcompensating by possibly smothering him? Just a speculation on my part.

Do your best to have some more confidence in yourself. Take care of you. Trust him and negotiate his interactions with other girls if you haven't done so already. Give him some room to do as he pleases as long as it is within the boundaries of your relationship. Don't monitor him, so to speak, but over time you'll see if it is working. Actions speak louder than words.

Take care and I wish you the best. I have bipolar disorder, too, and it is very challenging but you are more than your illness. *hugs*