I understand that he is going through a medication change right now, but I worry about the strength of your relationship if he is only texting or talking to you once every week. Regardless of his bipolar diagnosis, if he is disappearing on you, that means he either is not or cannot (because of the depression) commit to your relationship. If he is not able to reciprocate to fulfill your needs, maybe it is best to just be his friend right now and put your romantic relationship on hold.

Having a mental illness is no excuse for treating your loved ones poorly. He still needs to be held accountable for his "disappearing" on you.

There's nothing wrong dating someone with a mental illness, we can be very "normal," but as I said, it should not be an excuse for maltreatment of flightiness.

Good luck,

Seesaw