barely see my boyfriend and im desperate

hi, my bf (25) and i (23f) work at the same job which is where we met and started dating on new years. first bit was great- we met up outside of work often, progressed kissing and making out, got to know each other a little more and share things, it was amazing for the first month. and at work we were obviously professional but still just very friendly like besties on the job, but we still met up on dates.
now, almost three months in we barely see each other. we are only at work together once or twice a week and i see him for maybe a few hours then anyway. at work its stifling, because i know we cant flirt and our collegues know so theyre watching us and judging. he is also very work driven so obviously he wont focus on me for the time we get together, and we briefly kiss when he leaves and i do the night shift.
and he never asks to meet outside of work anymore, and when i ask he says hes busy. he has some family issues going on i know, but every single day off he gets or even time after work he says he is busy and cant meet me. its so upsetting. im getting frustrated and desperate, like seeing him at work is upsetting now because i know i cant interact with him and i badly want to. and then i get depressed constantly having to ask if hes free on a day off and he just says no, he apologises and sounds sincere, but still cant make any time for me and i feel awful.
i dont know what to do!!! we have a week off together soon that we both originally booked for a little holiday, but he said he might not even be free that week now!!! what do i do... i really want this to work out as he is so fun and nice when we actually do get time together.