Mick, I feel so sorry for your current girlfriend with this behaviour. Earlier in this thread you talk about going through a bad break up and how it affected you mentally and physically. How will your current girlfriend feel when she finds out what you have been doing or when you jib her off to shack up with this new girl.
Also, how will this new girl feel about you when she finds out that you were in a relationship when they first met. She will always be suspicious of you and trust can't be built from a cheat or lying.
You know what you have to do Mick to sort this out once and for all, you need to do the right thing and post some rude photos of said women in this love triangle and the ex who loved snorting coke off lads dicks while you stayed at home watching " Come dine with me "