First of all, I'm sorry that you are having to ask this question.
Now, if you're boyfriend went willingly, than there isn't much you can do.
If you suspect that he was influenced by anything than try to convince him of this and hopefully he comes around.
How to deal with your friend...
I would try to work it out.
I always hate to see friendships go to waste over things like this.
It happened to me once, although I am a guy and it was my girlfriend who left...
I hope it all works out for you.
Now, if you're boyfriend went willingly, than there isn't much you can do.
If you suspect that he was influenced by anything than try to convince him of this and hopefully he comes around.
How to deal with your friend...
I would try to work it out.
I always hate to see friendships go to waste over things like this.
It happened to me once, although I am a guy and it was my girlfriend who left...
I hope it all works out for you.