Should I still be angry (or more angry) at him?

So my boyfriend and I have been seeing each other for about 3 years. Recently I saw Facebook messages between him and this other girl, I couldn't see the full message history but I saw that he was apologising for something he'd previously said/done to her, and that she was questioning him on our relationship and on whether he'd ever cheat, to which he said he never, ever would. There were a lot of kisses flying back and forth at the end of every message too. I confronted him about this and it turned out that she was someone he used to have a 'relationship' with over the internet, and he'd been talking to her whilst he was drunk on a night out. Apparently the conversation was mainly about our sex life!? Which is just totally inappropriate anyway! Never mind with someone he used to have a thing with! He knew exactly what he'd done and confessed everything - he seemed so upset that he might lose me and even talked about wanting us being together for ever etc, etc and at times seemed on the edge of tears. I forgave him on the condition that he never speak to her again and that he deleted her off Facebook, which he still hasn't done... What should I do? I've had an amazing time with him, but I can't seem to move past this in my own head. It baffles me why he would even start to talk to her again in the first place. Am I right to keep bringing this up or am I just seriously over-reacting? Any advice would be greatly appreciated. x

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