Getting Over The Past

Long story short; a couple months ago I found love notes, underwear, and locks of hair from my fiancés ex from 10+ years ago. I felt hurt and betrayed and confused as to why he would still have such things after so long. I feel like hes still holding onto the past and possibly still loves his exes. He claims that the underwearwas just a symbol of his conquest of becoming a man and that really none of that stuff even mattered much anyway. He said that he was just apathetic and lazy in regards to getting rid of all of that stuff. He felt embarrassed and ashamed because he admitted it being childish and immature of him in the first place. He wanted to reassure me that he never really was in love or truly loved anyone before me, that he didnt know what love was until he met me. That his past doesnt matter and never really mattered even at the time. I want to believe everything hes telling me, but I just cant shake it off my mind. Am I crazy?