I am getting married in just a week and a half to my fiancé. We have been together 2 years. In May we visited his family and mine. Whilst with my family we went to see a baseball game. I later discovered that he had texted his ex that he went to the game while he was with my family and I. I knew they were friends but that he texted her shocked me. He said that whilst they were dating he had told her it was his dream to go to a Cubs game. He had never told me this, furthermore when my family and I asked him if he wanted to go he said that if we didn't have time it wouldn't matter. A couple of weeks later I looked at his old phone and the contents shocked me. I realized that what he called a friend he talked to from time to time was someone he talked to frequently and the contents did not seem to be platonic in nature. Whilst we were dating he would text her that he missed her, he had dreamt of her and even talked about my past with her. When we first started dating for Halloween she sent him a picture of her costume - she was wearing a corset and asked him what he thought of it. Some of the information was very disrespectful, especially in regards to my being a virgin when we started dating. He had not been completely truthful about her and the kind of relationship they had, as well as other relationships he had in the past. This ex is someone he thought was the 'One' and she dumped him after 6 months to which he was heartbroken. A year later they met again, had a one night stand and soon afterwards she got together with her current boyfriend - that was 4 years ago. The text messages up until we met and started dated showed him pouring out his thoughts to her but also showed a longing for her attention and someone to provide him with the affection she had shown him. When I confronted him he was angry about me looking at his phone. At first he said they were becoming less and less of friends and that he did not invite her to outings with our friends out of respect for me (however this was a lie and when I confronted him about this for proof he evaded answering and moved on with the conversation). I asked him to not be friends with her anymore but only after his mother got involved did he say that he would not contact her but would reply if she contacted him. He said this was because he did not want to cause drama. I acquiesced to his request. A few weeks later I saw that he was using inPrivate Browsing on internet explorer, which again caused an argument and we went to couples counseling. He stated that he did not have feelings for his ex and the inPrivate Browsing was because he wanted to retain his privacy but that he would not do this anymore.
A few weeks ago I found out from him that he looks up his exes on Facebook a few times a year - he said it's not because he has feelings for them but that he is curious what they are up to. I saw that over the past two months he had searched for the ex who was his friend 6 times. On his birthday and she messaged him but I had to confront him to learn the truth - he hadn't let me know though after the occurrences of before he said that he would. He is frustrated that it should matter to me when he says all that matters is that he loves me and wants to marry me. However I feel that his actions have been disrespectful and his inability to be completely honest is not healthy and very worrying. We are getting married soon and these details are making me nervous. Am I overthinking his actions or are my feelings justified? I have always been open and honest with him on my relationships or when anyone from the past has contacted me, because I believe this is respectful to him. Since we started dating I told him that honesty means the most to me. I was very shocked by the revelations of the past few months and I feel like I cannot trust him like I used to. I try but then someone else occurs that makes me withdraw and feel despondent.