My Boyfriend Of 5 Years Is Making Excuses To Get Engaged!!!

When we first met we decided to take our relationship day by day without any promises. Two years ago, he talked to me about getting engaged and he told me I was the one. It wasn't the right time because he wanted to open a business (which didn’t work out). I have an amazing relationship with all of his family so I know that can't be the problem. Now he decided to go back to school to do a 3 year program and he says he want to finish school before we can get engaged!!! There is always an obstacle and it seems to me that he creates them. I'm 24 and he's 28 years old. I really love him but I love myself too!!! Is it just me or there is something wrong with that picture?