This is going to be long but I don't want to drip feed.
Dp has a female friend he's known for years, it's only recently in the last few months that he's began meeting up with her frequently. Previous to that he hasn't seen her for years. This coincided with her becoming single. She is a lesbian as far as I know so I shouldn't have a problem.
The first few times they met I was a bit jealous, I felt really awful about it but thought ok it's a friend I need to have a word with myself. They started meeting up every couple of weeks for a drink and texting in between. I admit I can get a bit sarky when he talks about her.
To my shame I've read the texts and they're very flirty, not Dp's usual style of texting at all. In one he joked with her that all she needed to do was admit that she had been in love with him all these years. She joked back that if she was still single in a few years she would marry him.
Now he's lying to me to meet her, probably because I do get a bit jealous if he mentions going for a drink.
The first time he lied was quite an elaborate plan, on the Sunday he arranged to meet her on the Wednesday for a drink. Tuesday night he orchestrated a massive argument and went to stay at his parents after work Wednesday for the night so he could meet her without me knowing he was home late.
Today he has told me he is working late. I've found out he's skiving off and going to fix something in her bedroom then going back to work.
He doesn't know I know any of this, I've been keeping my powder dry to see if anything else happens. I'm not happy he's lying to me over this regardless of what's going on. If I say anything he just tells me she's a lesbian, just a friend.
What do I do?