^^Even if the guy stands up for her now and gets married, at the end of the day his mom is HIS mom. Remember in TLK's thread "guy's perspective on love marriage", he mentioned that after a guy gets married to the love of his life against parents' wishes, he starts to feel guily and to make up for that guilt becomes extra caring towards his family and sometimes is unfair to his wife. His mom is HIS mom. He can come under her influence anytime and not treat her good.
Or even if he doesn't comer under her influence, she would never gain that DIL spot in the family. She would never be respected in his family. She would not have an in-laws house to go to on every eid occassion or other big occassions. Girl you gotta be very careful, because it's a matter of your whole life not just a few days.
His mom has called your dad today. It's not a small thing and it's not common either that in-laws call up girl's parents to complain about her ..it only happens in bitter situations. So do THINK about it.
Guy may be a gem but again weigh out the situation carefully. You seem young so don't rush into any decision. Also, do Istikhara!
Best Wishes,
Chaachi