Wife Constantly Researching Her Ex From 27 Years Ago

I have been with my wife now for 26 years (married 23), and have only recently discovered that she constantly googles her ex (her 1st love, college bf). There has has been a little email/phone contact between them over the last 7 years. He lives in another state, so they don't see each other. At one point when he wasn't responding to her other that an annual birthday type of greeting, she sent a demanding email to him, stating she wanted more of a friendship, and that the once a year contact wasn't enough. That email was the one that made me real uncomfortable with the on-going contact He has made it clear that he does not want a close relationship, but he'll respond to her when she checks in. Couple of months ago after she called him and had a 30 minute conversation , I told her I had enough with the contact, that I wasn't comfortable with it and it had to stop. Well she agreed (but only after we went to therapy and the therapist 100% sided with me), and the contact stopped. But I can't understand how after she caught up on his life in that call, yet in the 2 months since then, she has google searched him a number of times to try and see what is going on in his life, despite freshly knowing what is going on in his life. So I asked why she is constantly looking him up (he is on no social media sites, so there is very little information about him that comes up on google), and she said that it brings her happiness. That she is able to go back to a happy time in her life - those college days with her 1st love, 1st everything (and that I don't understand how girls feel about their 1st loves). My wife has had severe depression, with some very bad episodes recently, bordering on BP. She says she has no desire to be with him (that he also suffers depression and has had health and financial issues - and is happily married), just that she has a desire to bring up those happy memories. I can't help but think that if she is contantly looking him up, that while she is not leaving me (and I'm convniced that is the case), that she must be sad that she is not with him and that there is some desire (but she wouldn't make it happen) to be with him. That is how I interpret the need on her part to constantly search him. She denies it. I'm at the point where I'm almost ready to divorce her as I see this as a problem in our marriage if she must constantly google someone from 27 years ago, that she has not seen since then and only spoken to a handful of times. Am I overreacting to this? I can't help but see this as a problem with us and feelings for him that are unacceptable. It is one thing to have happy memories, but I interpret her acts as being strong current feelings for him that I cannot accept.

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