If your friend has THIS MANY concerns about her, why is he even contemplating marriage with her in the first place? When you want to marry someone, I would think that you’d KNOW FOR SURE that you want to spend the rest of your life with that person. If he’s asking you to get anonymous opinions, that indicates he has serious doubts about this girl, so he’s not ready for marriage.
She’s verbally abusive and that can leave deeper scars than physical abuse. If she can so easily lose control around him, she can do the same around his family, thus potentially destroying relationships. Although marriage would change things and you can’t always stay out late after midnight, she does seem possessive and maybe this stems from some insecurity. I don’t think her anger management problems developed overnight or developed when they started going out. They are a part of her and who she is and that’s really hard to change unless the individual makes a proactive effort.
If he’s that hurt by her, why is he in a relationship with her? He’s only 21 and there’s no shortage of girls. What does this say about him? Does he respect himself enough? Does he have low self-esteem that he wants to marry someone who doesn’t even give him basic respect? Has he talked to her about how her behavior makes him feel? If he already has talked to her and she only seems to be getting worse, then there’s only so much you can do. What’s next? Counseling? No, he shouldn’t marry her, not if he he’s still having these issues. He needs to weigh the pros and cons and maybe give this more time and get some space to sort out his thoughts.