You have visited our old site. Proceed to our NEW SITE - https://kissesandhuggs.org
That is a bad attitude by your brother and your fiancee did well to report it.
I advice, go and confront your brother in love. Tell him what you heard and how unfair it is to do such. Do it respectfully and gently. Hopefully he can be sober and let go of it.
Meanwhile tell her to be watchful and wary of him. If he doesnt desist from troubling her, then you should report it to your parents too.
Above all, pray for him.