Handling facing the other woman on a regular basis

Hello, I am new on here. I have been with my fiancé for over 8 years, we have lived together for nearly as long and we have a 5 year old child. After an absolute dream relationship and big big love we grew apart after I fell pregnant and we both made mistakes. He made the biggest by starting an affair which lasted for 10 months and ended this April only because I found out. Despite everything I decided to stay and since d-day our relationship has been better than in the last few years. But I am aware that this is the "honeymoon stage" and this high won't last forever. My main problem is the other woman. I want to leave everything behind me, want to stop obsessing about her but it is so difficult – she is everywhere in my life. He had ended the affair immediately but they are work colleagues and see each other every day, not only that but he had decided to bring in our child into the affair and went on family days with her and her child – subsequently our son had a crush on her daughter and kept constantly asking about her in the first few weeks after d-day. She also lives very close to us (like 5 min walk) and I recently found out that I know her neighbour. This new friend of mine told me last week that she at first couldn't place my other half but then remembered that she knew him from – well her neighbour. She saw him frequently there. Another work colleague of mine also told me of having seen my other half in this street quite frequently. We cannot move away from this area so I have to live with the fear of possibly bumping into her all the time. My closest friend sees her now all the time (I had shown her a picture). And yesterday I went to pick up my child from summer daycare and in walks right in front of me – her. It was our first confrontation after d-day and I nearly had a nervous breakdown. I just stared at her and she kind of smiled shyly and looked away. We waited in the same room at the other end of the room for our children and when hers came out she ushered her daughter away very quickly and I of course did not hurry behind her but walked out slowly with my own child. Now I have to potentially face her every day for a week at pick up time. I know a week will pass but I cannot get her out of my life. I know I am the stronger one. I have won, the man has stayed with me and more importantly I have chosen him. But I cannot help feeling defeated whenever I think of her. Seeing her in real life, moving, breathing, fleshy and alive made the whole affair very very real again. My imagination of them two together does not stop. The hurt does not stop.

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