I don't see a problem in this especially if the man you are marrying fits his body structure. There are some men that are very tall and work out. Their weight is around 200 or plus pounds. The men aren't overweight and they don't have any health issue. I've dated men that were over 6 feet tall and weight 200 pounds. They were bodybuilders. I am not very tall and like you don't weight that much. The man understands his weight and his body strength. They are well aware of this when being with you making love or just sitting around the home.
If you love this person, no matter how much they weight, you can always find a way to make it work. On the other hand, if you are worried about his weight, you should bring up your concerns before you're married.
I believe that you have already addressed this issue with him because you've been dating for a time now. You have fallen in love with him and want to get married. I think he understands his weight and how to control this to not hurt you. Otherwise, you would have stopped seeing him some time ago.