WIT12: I feel like i will always be the girl that made him lose his relationship with his family and friends
That's not on you; that's on his family and friends.
It might help your BF to seek some counseling to help him untangle the mess of beliefs and emotions that he must be experiencing as a result of leaving this religion. It might even be helpful for you to go with him, at least for some of the sessions.
The one problem is that most therapists and counselors are not really familiar with the issues ex-cult members face. (Yes, JWs are a cult).
Here is a link to a resource that you might find helpful:
Although she is now retired, Ziemann is both a therapist and a former, born-in Jehovah’s Witness.
This is from her website:
"Bonnie has the skills, knowledge, education and experience with which she can offer others help to leave high-control environments and recover from mind-control, coercion, manipulation and/or abuse."
Best wishes to you both!