How should I handle this situation?

I have been with my boyfriend for almost a year now and I've been the happiest with him than I've been in any other past relationship. But lately things have been changing. He got a new job about a month ago and so Tuesday-Saturday he goes to work and Monday- Thursday he goes to classes after work. Also, he wants to join the army so he goes to the gym quite a bit. I'm reasonable and I know he needs time to dedicate to work, school, and the gym but I feel as if I should be a priority as well. We are in a committed relationship and lately he just makes excuses to not spend time with me. I've told him how it bothers me and I feel as if you make time for the people and things you care about. He says he will but never does and continues with excuses. This has happened for over a month and he even skipped out on our anniversary. I'm having surgery really soon and he won't spend any time with me to comfort me, while when he broke his ankle a few months ago, I was there before and after work helping him heal. I brought him his favorite snacks, I went to about every doctors and physical therapy appointment and even went to the gym to help him walk around to workout his upper body. He has been liking girls pictures on social media when he knows it bothers me even after he promised he wouldn't do it again, but still does? Then he makes me feel like I'm overreacting about it. I don't want to give up on my relationship but I'm tired of being the only one making effort. Especially when I need support more now than ever. Need advice... thank you!!💙