Another thing occurred to me. The only reason I can think of for a pair of adults who are in love to not proceed with marriage fairly soon is that one of them wants to keep open the option to leave easily. We know that's not you. So I'm figuring he wants that option.

Now a woman's youthful beauty only lasts so long. At age 28, your looks haven't begun to seriously fade. But they will. There are men who have a strong preference for young women and tend to trade in older models. You'ld hate to spend another 5 years with him and then find out he gets restless. Much easier for an older man with a good job to find another woman than it will be for you to find a new man. Plus, he can shop amongs women 10 years younger than him. You probably won't want to. Your range of choices will be narrower.

One of the reasons for marriage is to give the woman greater assurance that the man is not just passing through her life because that is unfair to a woman who is committed.

Keep in mind that, if you want children, you only have so many years left to do that. (Obstetricians say age 24 is the ideal time for a first baby. Problems are more likely from mid-30s on.) He has decades left. If he is making all his moves based on what's best for him, with little thought of what might be optimal for you, that shows a deficit of love. It's hard for me not to suspect this guy is somewhat self-centered.