How often do you see him, OP, and how often would you like to?
From my own experience/that of my friends, it often (though not always) seems like, in non-cohabiting relationships between 40+ couples, the burden of arranging time together often falls on the woman, and is often a source of frustration for said woman.
My friend has had several relationships end because the guys were simply not willing to make the effort to make themselves available often enough to meet her need and desire for companionship.
And I, too, recently ended a FWB situation, for a few reasons, but one of them was that I felt I had to book in time with him, he was available once a month at most, and even that felt like he was doing me a favour....
I am now seeing someone who will happily shift things around to make the time to see me, currently at least (obviously I will see if that changes, I know the honeymoon phase is generally good..... He's an ex as it happens, but we were apart for long enough for it to still "feel" new and like he is on his best behaviou, in many ways).
Anyway, the advice I always gave my friend, and myself, is to work out the absolute MINIMUM amount of time you would need to spend with your guy in order to be happy in the relationship..... And tell him!
And if he feels that's too much/he can't commit to it..... Then off he goes..... Because why should you ever accept less than your bare minimum? And I guarantee there there will be another man out there, who WILL be happy to meet your needs.