.

Tell your friend to slow down on his future plans with the girl until she gets a divorce from the man she married in court. In the eyes of the law, your friend's girlfriend is still legally married and any other marriage will give room for a suit of bigamy against her.

Bigamy. Marrying two or more people at the same time i̶̲̥̅̊n̶̲̥̅̊ court or i̶̲̥̅̊n̶̲̥̅̊ church. Tell her †☺ arrange ɑ̤̈̊ quick divorce. He can call ♏ε̲̣̣̣̥ †☺ help him if he wants it done