I hear you
But trust me, I know from experience that there's a distinct difference between unavailable and extremely busy.
I had unavailable who I spent time with daily, now I have an extremely busy who I barely get to see.
But at least the end is finally in sight, his schedule should relax in the next month or two, and then all our patience will pay off.
Just remember to keep the lines of communication open, and keep that line direct.
That way you will know if you should jump ship or anchor it.