I have only myself to blame for this

My partner was behaving strange, he would take his phone everywhere he went, but one night he forgot to take the phone with him he left it unlocked. I know I was wrong but because of his behavior I had to look and when I did I found out that he was searching for many females some I knew of to be his exes but damn why would he be searching for females on Facebook constantly? Anyway long story short I asked him about it and he said he was searching for them to block them ? I must admit that our relationship took a bad turn after that because is hard to picture my significant other actively searching for woman on his Facebook.