Go away for the week-end with him to another city.
Do not do any sexual activity. Kissing on the lips and a hug is fine. Anything more than that: do not do it and do not allow him to do.
See how he reacts. See how you get on with him. See how he handles you being assertive about no sex on this trip.
Ideally have some way of secretly recording your bedroom scenes. As a precaution in the event of you getting raped, sexually assaulted, threatened, hit. (I don't know the guy, so I don't know the chances of this happening. But better safe than sorry)
If everything goes OK - IE he behaves well, respects your sexual boundaries, you get on well during the trip - spend more time with him. Aim to make one of your next dates a visit to his parents' home. Observe how he speaks to and interacts with his family. How he speaks to them will be how he speaks to you in 2 years time.
Discuss children with him. How many he wants and when he's planning on having them. Does that match what you want?
After spending 2 or 3 more months with him you should be able to decide whether he really does seem to be the man for you.
If he really does seem right, you can then "marry" him. The form of this marriage could be the traditional way with a ceremony and a certificate. Or it could be a "personal marriage". Where it's just you pledging yourself to him verbally and him pledging himself verbally to you. Your word is your bond. And you should know him well enough by then to be able to take his word as his bond.
With either an "official marriage" or a "personal marriage" there's always the option of divorce if there becomes a good reason for you to divorce. Divorce is your Get Out Of Jail Free card.
At the back of your mind during all this process, should be that you are an attractive and desirable woman and there's an abundance of great men out there. And fairly often, the men that seem the best as you first get to know them, turn out to be the worst.