Originally Posted by hudsonmark
However, a year into our relationship she decided she won't have sex w/ me saying that it felt "unnatural" for her. Her mind is ok w/ it but her body doesn't feel the connection. Last month she admitted that she has a new bf and has sex with him
Has she ever in the past maintained two healthy sexual relationships at the same time?
If not, she may be having trouble moving from serial monogamy into polyamory. It may feel "unnatural". If that's the case, you might find that talking to her about the way you feel about each other and how she feels about her other relationship helps. Making friends in the poly- community where you are might help make things seem more "natural" as well.
If she has been successfully poly- in the past, it does sound like her feelings for you have simply changed, and you're going to need to decide what to do about the new, non-sexual relationship you now have.