@Nythlia18,
You should stay out of this. There is no way that you can help him. There is no way that he can be there for you. This is not your business. Sorry to say that, but that is the way it is.
The legal case will go forward. You don't want to hear this,
it will be impossible for your boyfriend to have any healthy relationship until this is resolved. If you really love him, you will back off and let him figure this all out. If you don't, you will just become part of whatever mess is going on and make it worse.
I don't know if there is two sides to this story. It is possible that this woman drugged your boyfriend to get herself pregnant. If this happened, it is a criminal act... she should be jailed. But probably
you don't know what really happened. All you know is that this is a mess that you are stepping into.
At most you should be supportive of his decisions. There is no way that you should be expressing any opinions to him about what he should do.
In my opinion, you should be supportive, but then back out of this relationship. It is best for you. It is also best for him... when a person is in the middle of a messy emotional situation, it is not the time to be jumping into a new relationship.
This man should listen to his lawyer. If he was drugged, then there should be a criminal case. You shouldn't have anything to do with this.