My 40 year old boyfriend is moving out of state and refuses to propose

My boyfriend is 40 years old and I am 24. He was married when he was 27 but the marriage ended after two years of him and the lady. My boyfriend and I met when I was 22 and he was 38 and I initially didn’t want to be in a relationship with an older gentlemen because of age difference but he won my heart over after a month of chasing me down. He has a great job and earns a lot and I am just starting out in my career. This year after two years of dating he’s got a job offer to move to Washington for a really amazing job opportunity. I was expecting him to propose before moving as he proposed to his ex wife just after six months of knowing her and he also proposed to her because he was moving states for his masters at the time. I am hurt and I feel resentful he hasn’t popped the question and I am thinking of ending it to maybe pursue things with another man that hasn’t been married before. I have told him I want marriage and to start a family but he still refuses to pop the question. I have felt worthless this year and not good enough because of this plus I’ve given so much of myself so young to my older boyfriend. What do I do?