I'm so confused by their behavior!!!!! Why are they doing this?

My boyfriend and I dated for a year ( hes 26 and I'm 25) and we've been in a long distance relationship. We live in two different states but we made it work just fine. His parents were always the problem. We've been fighting for each other for a year and trying to change their minds about accepting our relationship for that long but unfortunetly they never changed their minds. At some point though we both thought they changed their minds because his mom told him that she really wanted to meet me again (after having met them the first time) and both his parents actually really wanted me to attend his med school graduation and we're excited that I was coming and joining them to celebrate. They even invited me over to their house for dinner and took me out for dinner on my last day there before traveling back. When I got back home, everything was normal for a days days until last week. He gave me bad news and said that he told his parents that he wanted to come visit me and have them join as well so they can meet my family but they refused and made it clear that the relationship should end and they didn't want him to talk to me anymore so we broke up just last night, after fighting for a year. He told me that it has nothing to do with me because they actually really like me but they just don't see this working right now so the timing is wrong because he hasn't gotten a job yet and he isn't financially stable yet. We come from a culture where parent approval is a must!