This is just an allegation but I suspect this is a scam and i'm still doing some investigation

Hi I have been chatting to a marine who i met on this site who is apparently based in afghanistan. He then wanted to communicate telephonically. But in order to do this via satellite I had to have my home line connected to the base in Afghanistan. The cost for this activation was $350 and i should have seen the red flags then but I was vulnerable as we had been chatting every day and I think a part of me wanted him to be geniune. Anyway I said i did not have the money so the next day his 'commander' raised $100 and paid the initial deposit and a receipt was emailed to me confirming the deposit and due date for the balance. He continued to chat daily and after declaring his undying love always reminded me of the phone activation and to please hurry with that...as he needed to hear my sweet voice. What disturbed me most was that the balance outstanding was to be paid via western union an individual! I really wanted to give him the benefit of the doubt but it was way too familiar - like a 419 scam. Anyway I googled the individual's name and found this person on Facebook. I added her as a friend and she accepted. I then emailed her telling her my story but not into great detail - i was just curious if she was the same person the money needed to be paid over to and where she was based - did she work for the telecommunications or was she at the marine base. Anyway it turns out that her boyfriend is the same marine that I have been chatting to. She has never met the guy but she has been receiving money which she pays over to a charity in NIGERIA on his behalf. Ofcourse she does not believe that this is a possible scam but i am convinced and I am just making a couple of more enquires before I expose him.
NB: Ladies please be careful - these scamsters/syndicate are ruthless. I know we are looking for love but hey dont get so caught up that we become gullible - as soon as money is mentioned RUN.