@Stuckinthepaststill I'm speaking as a divorced woman and if I'm honest, I think there are separate issues here:
1. We were together for years, since we were at school, but split in our thirties.
Are you are still feeling the regret you feel of losing your 'first love' - it's something that lots of us have experienced - but we evolve and grow and mature and realise that our first love may not always be the 'only love' or the 'right love'
2. but, unbeknownst to me, he was also seeing someone else — who he’s now married to)
This will definitely add to the WTF! Not to mention the hurt!
And it's not an easy thing to accept
- but you say I’ve also remarried and have two DCs,
...........so one question is why did you marry someone else and have children when it seems you still wanted to be with someone else?
3 .It w.as all a bit messy, although I didn’t realise quite how messy at the time (we were going to marriage guidance counselling)
It's not clear what the 'mess' was, but it seems you both couldn't work it out (for whatever reason)
I also hate HER because I feel she’s living the life that was meant to be mine
.....did you really want to continue living the life you were living with him?
Or was it just habit and fear of the unknown future?
Or did you imagine your life with him would change for the better?
How do you know what her life is like ?
On the face of it, your life probably looks good to outsiders.
How do you know what's going on her marriage
You haven't said whose decision it was to finish the relationship - who walked away? And that makes a difference : whether it was your decision or not. And it's always harder to accept when it's the other person's decision to leave,
But you've made your decisions and got on with your life and made a family and new relationships.
How do I move on? It’s been years as I say so time’s clearly not the answer. And the rational part of me knows how ridiculous it is to still be hurt/grieving/bothered — but that doesn’t mean I can just switch off my feelings. I don’t want to be this bitter person, though. I have a good life, and so much to be grateful for (and I AM grateful!) — how can I stop the bitterness/anger?
To be honest, only YOU can make that decision
Either you live in bitterness and regret for 'what may have been' (but obviously wasn't working) or you realise the security and happiness you actually have in the present.
It's life and we all live with the consequences of our decisions.
Sometimes it's not easy ............... sometimes we need to make a very conscious decision to let go and just trust that our present lives are better than 'what could have been'
Life is very good at guiding us in the right direction - even though we think it's not right!
I wish you well, take care x