I'm 23 years and 14 years on from the two big relationships of my life where both times they got younger fertile women pregnant before finally admitting there was someone else. Once was enough, but twice! After my son was born (with first partner) we tried for another, I had miscarriages and gave up hope.
I told my friend I'd given up hope. But she wasn't my friend she was the OW and I didn't know. She used that to suggest I didn't WANT another child. (He told me this).
The second - a horribly similar story.
But, this is not about me, I'm not trying to derail your thread. I'm still angry- I will not use the word bitter, because it's thrown at women as a throw away nasty judgement. I was hurt, to my core. Then it became anger. And it's never gone away. I don't act on it. I know it's there. I've cut people who associate with either of the men out of my life completely, I don't need people who think it's ok to break a heart.
On the outside I'm a successful, stable intelligent and kind woman. But if I see OW in the park (they live close to me) the adrenaline floods back like it was all yesterday. I've learned to feel the anger, to feel the adrenaline and to know what I would like to do. And I don't act on it. Sometimes it is incredibly difficult. 23 years have passed but it's never gone away, so I would say it's normal to feel angry with the people who have hurt you to the core. And sadly you have to find ways of dealing with the anger that comes up EVERY FUCKING TIME without acting in a way that could get you arrested.
I swim, I tell a friend, I stomp (walking fast and hard), I do a hypnosis session on you tube, I do anything I can to cope.
Sorry for the long response, I'm so sorry you are feeling this way. It's shit. It's not fair and (for me) it will not go away- so you have to find ways of getting the adrenaline and cortisol down. Talk, exercise, a reward for yourself for not doing the thing you want to - anything. It's goes away as do all feelings, but it comes back. Sending unmumsnetty best wishes and hope that you'll find your ways to deal with it.
Nothing lasts forever, not feelings, not relationships, nothing. They come, they go.
Focus on how much easier it feels when the adrenaline is not coursing through your body, and do the things that make you happy. Keep on keeping on.