I'm a 42 year old man with a partner (I'll describe her as such for convenience, although as you'll see the situation is a little less clear cut) of the same age for 16 years and a 6 year old son. For a long time - I mean years -, the relationship between my partner and I has been essentially platonic. We sleep in the same bed, but there is no sexual contact between us (mostly at her request). She's also been very clear with me that if I wanted intimacy, I should seek it elsewhere (even saying explicitly "If you need sex, go and have some sex").
We've been basically co-parenting for the sake of our son, and while we get on OK for the most part, there's not much in the way of affection; in fact, she has quite a quick temper, frequently raises her voice to shouting/screaming level during arguments and has hit me round the head on several occasions over the years when very angry (I must point out I have never, ever done the same to her). Things almost always have to be on her terms, and she has issued the threat of taking my son away from me on more than one occasion before.That said, things are generally civil for the most part.
So, on to my dilemma. I recently met someone else, and we clearly hit it off. I told my partner about this, and she was initially very supportive of the idea of me going on a date with this lady; she was even playfully calling me "casanova" and treating it all as a bit of fun. I took this, in the context of our platonic/co-parenting/whatever-you-want-to-call-it relationship, as a positive and supportive thing. I was honest with everyone - both my current partner and the new lady - about the situation as it stands; I didn't want to deceive anybody.
Fast forward two weeks. I've been out twice with this new lady, we like each other a lot and the potential is there for this to grow into something more. In the meantime, however, my current partner has grown increasingly cold and detached. We have talked about this, and it seems that for all her rhetoric before, and the platonic nature of our relationship, she is not happy with me dating this other woman. She has told me, in so many words, that I need to choose between seeing this new person and living with my family.
I'm feeling so torn - maybe I was being naive to believe she'd be OK with this in spite of what she's been saying for years, and yes, maybe I did try to have my cake and eat it - but I really feel at a crossroads here. Should I abandon any hope of a new relationship to stay living in the same house as my son, but at the cost of being happy in my love life, quite possibly permanently (I'll be approaching 60 by the time he leaves home)? Or should I follow my heart and my happiness, and possibly grow into a better and happier man as a result of being out of an environment where I haven't really been happy or myself for a long time? Before all this happened, we were making plans for the future, including moving abroad as a family at some point within the next year or two (as a result of Brexit, but this isn't the time or place to get into politics). This would completely throw all that up in the air.
It's also worth mentioning that a large part of my worry is what will happen to them if we do split up. She doesn't have a full-time job (she is an actor/ performer, and only has occasional jobs) and is home educating our son. We are also a fairly low-income family - I do not have the means to run two households, and I don't want them to end up in a hostel. Of course I would support them as best I could to the limits of my ability. But if I stay, I fear I'll be resentful and miserable from now on, and that won't be fair to anyone, including myself. This feels almost impossible.