If it starts before marriage...
Get your brother and your girlfriend in the same room and confront her openly, if it is true then there is a serious issue to be had.
EDIT:
I see she is pregnant, this changes everything. You will just have to work this out. It will not easy but you cannot just dump the mother of your child like that.
Now is the time for both of you to step up and either seek counselling or, if you are religious, see a Pastor to help both of you through this.
Get your brother and your girlfriend in the same room and confront her openly, if it is true then there is a serious issue to be had.
EDIT:
I see she is pregnant, this changes everything. You will just have to work this out. It will not easy but you cannot just dump the mother of your child like that.
Now is the time for both of you to step up and either seek counselling or, if you are religious, see a Pastor to help both of you through this.
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