It can provide health and life insurance to a spouse and children. In case of his death it will ensure benefits for you and your son. In some states you would be considered to have a common law marriage, but only your attorney can advise you on that. I lost a husband tragically and unexpectedly at 24. We had 2 children and I was 9 months pregnant.
Communication is the main key.
Don t let him blow it off. If that doesn t work perhaps counseling would help you both come to a decision that you can live with.