Can I Ask My Boyfriend When He Will Propose To Me Because It's Taking Too Long?

My boyfriend and I have been going out since we got into University, that is like 7-years ago. We are both done with school and he has gotten a good job and lives alone now while I am still in the process of getting a job. We get along well but he has just refused to pop the question so we can get married and move on with our lives. I know he loves and respects me but this his delay in getting married to me is beginning to bother me. I have been asking myself if he is thinking of dumping me but his care and affection says otherwise. Should I pick up courage in asking him why he hasn't or I shouldn't border?