My homophobic teacher broke my friends relationship with her gf

At first he was trying to out my friend, luckily he didn't but sadly my friend and her gf broke up the reason was her gf got depressed about the shit that he had been saying to her, telling her that their love will never be holy and that she doesn't realize it yet but in the future she'll just laugh it off when in fact she will not, because this past few days I noticed that she is kinda down, now I'm suspecting that she might get depressed again since she literally broked down during a presentation on his subjectand, he was also giving shitty remarks while she was ranting to us, saying 1 down hinting that his gonna do the same to my other 2 friends whose also in a same sex relationship.