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ok, full story, short version.....
I met my g/f through her brother where we all work.
got on v well with her and moved in together a few months ago.
Discovered she had s*x with a guy AT WORK after we started dating. Blew my stack but agreed to start again.
have since found out from her brother that, before we went out, she had an affair with another guy from the same place who already had a g/f and a kid.
shortly after it was announced that she was pregnant and suddenly this guy is texting and ringing all the time.
Asked her if there was anything going on as the same thing had happened before. she denied it.