Please, can anyone put my mind at rest about why my husband watched his ex mistress as she walked to the metro?

I feel bad for you and I haven't read anything before.From reading the comments below you are writing about a continuing situation. Why are you putting your life on hold for him? Why are you with this stalker? Yes that is who you are married to.You need to run as fast as possible from this man.And run into a divorce court. He doesn't care for you.You need to stand tall,and be strong. He is obsessed with her.All that dedication to this tramp from him should be to you and noone else.He stared at her because he in love with her.Hes not the only stalker here! You came down to his level and you are turning into him.Which are all negatives.You need order in your life.Why is your self-esteem so low and feel you deserve this life? You love the Drama.You deserve someone who is in love with you and only you.When he takes you to bed its not you hes with,its her.Now do you really want to live a life of questioning everything he does? And stop making excuses for him.The writing is on the wall ! Its over for you both.He loves her and if she were to come back to him he toss you out so fast.Get out before we read the headlines about you.Put your energy into work or school and show him that you can be better off without him.Its in black and white for you to see Now open your eyes.