Idk if I can trust my friends anymore

I'm a girl having a really hard time trying to figure out if my friends are fake or not. As I recently found out from a friend of mine (we will call Cat) that one of my closest friends (who l won't be naming so let's call him Jake) had done something so unforgivable. A few months ago I had to leave early from school so I asked one of my classmates to give my gym bag to my friend Jake since he lived the closest to me. Well Cat barely this week told me that Jake had gone into my gym bag and started sniffing my underwear. I reasonably got very upset/disgusted and asked Cat where did they hear this from. They explained that they had heard from one of my other friends (we will call Sam). Jake had called Sam to tell her what he had done to my clothes he explained to her that "he couldn't help it and it was his hormones controlling him" and instead of Sam telling me what Jake had done she told Cat and they both kept it a secret as Sam was "saving it for later" (whatever that means???). At this point I was really annoyed and upset I just wanted to confront Jake about this. I did and he admitted to doing this but said he never told me because he felt horrible that he had done it. I can’t look past this I'm so disgusted by his behavior. I've blocked him on everything I could think of and cut contact. I even reported him for his disgusting behavior and told most of his friends about it so they know what a creep he is.

What I'm really confused on is why wouldn't Sam and Cat have told me this earlier. I asked Cat and he said that he felt awkward about saying it but told me because he couldn't keep it secret. When I asked Sam she told me she forgot that had happen but said stopped talking to him when he told her. I got upset at this because how could she forget something so disgusting happened to me. How could she be so okay with seeing me and Jake hang out when she knew he did that to me without me knowing. I even had spoken to a few other friends of mine telling them what Jake had done and they admitted that he has said gross things about me to them but never told me such as him saying "he wanted to pull my pants down and f me" I'm really trying to see their points of view but I'm starting to think my friends are fakes and just not real friends. I would have never kept anything like this a secret from them I'm really hurt by all this and I feel really vulnerable. Can anyone give me some advice on what to do?