nycindie, that is a good point - that it IS new and different and unusual and awkward. So it's okay to acknowledge that and try to work out how it will work out.
Inyourendo, also good points. I don't actually know yet if I'm going to meet L, or if Morp intends to keep everything very separate. I do know that Morp does not intend to give me up; I assumed L was poly, since Morp's been poly for many years now and from what I understand, the only two times he was monogamous were for his two (short-ish) marriages, at the requests of his ex-wives. So I guess I assumed that if he did get back together with her, I would still be with him too. But I think you're right, I don't think it's likely they will want to get back together.
I guess mostly I just need to wait and see how things go, wait until I have more information from Morp about L, about CM, about how they are going to fit into his life, and therefore, how I'm going to continue fitting into his life.
Guy - Dom/husband
Minx - sort of dating
Cru - (no longer dating)
Lee - Guy's girlfriend