I really need advice and please noone flame me as I know I have been stupid. I have been up all night.
For details of my previous thread here
In short, I caught DP of 6 years touching a girl he works with a few weeks ago. He has now been seen again giving her a not so innocent peck on the cheek, and asking for more 
We have a house together. I put in the majority of the deposit, c60%. We split the mortgage payments. It's well recognised the house is ours. He is a kind and gentle man (don't even know if this is true anymore). Never any arguments about it being our house. But I am not actually on the mortgage. At the time of buying, I had some issues due to other mortgages in the background so we just decided it would be easier if I don't get involved. Plan was on remortgage when fixed term ends, I would get on the mortgage and deeds as my other mortgages would have been disposed of. Remortgage is due in a few months, c6. In about 9 months or so, I am due a promotion (guaranteed). My DP, although not working with me, has a direct impact on whether I get the promo due to some connections (long story).
I ideally need to wait till both these events happen before leaving DP, but I am finding the situation unbearable. Worse, I am now worried that if the OW begins being receptive he may leave me before the events happen and I will still be screwed. What do I do? My plan was to sit out till end of the year but now I am concerned.