Nah !!! If it went that far someone would need to see the text and see what you've written. Hardly incriminating is it - have a nice Christmas !!! Silly cow needs to curtail that jealous streak - that's what this is all about...........trust me.
And the old dick, sorry man, should know better. Speak to CAB but mate, whilst I'm not a legal eagle I can't see where there are any grounds to get you out. Yeah, your firm might drag you both in and give you both a bollocking if it gets out of hand but what else can happen ? Like I said, unless something real serious happens (ie you clump her or abuse her on the firms time or premises) what can they do ?