Suddenly doubting everything

My husband is the most amazing guy ever. Everything I have ever wanted in a man is everything he is. We are together constantly and both get upset when we are apart. I never doubted his love for me... Until about six months ago. It started with some weird, random actions by him on Facebook. I would question something he would post and he always had a reasonable explanation. So I let it go. Then one night we were getting ready to go out and planned to meet another couple. He was in the shower and his phone beeped so I checked the text. While I was in there I snooped. Everything was normal and I was about to stop when I spotted a conversation with a girl named holly. It was basically friendly except when the topic of hanging out came up. my husband texted her a message saying "I don't want to f**k, I just want to see you." I immediately questioned it and there was a huge fight. He told me that he I misinterpreted it, and that he was trying to tell her he just wanted to hang out as friends, not like he was trying to get with her. I accepted that answer because it made sense I guess, but never really forgot. Last nite I found his old phone while cleaning and decided to check that. I found a slew of messages to other girls from his workplace. Most conversations were work related but then there would be random flirty comments. Then There was a two week long sexting convo that was quite explicit. I called him and freaked out. He came home immediately and explained that he and his buddies were trying to help their friend, Ryan. He began jokingly flirting with this ugly 50 year old woman and when they realized she was interested he let his desperate friend sext her from his phone. My husband even volunteered phone numbers of coworkers to verify this and they did. Ryan himself verified it and apologized. My husband told me he would never ever do anything, and he understands why this looks very bad but it started as a joke and just got out of hand. The issue I have is that many of the things in these dirty messages are things that my husband likes or does. It's also all written the same way he types things (you know, everyone has their own way of texting). Also, my husband is never mentioned in the third person, but Ryan is once ("Ryan and I are going there.... Etc"). There are a lot of things that do not match up, but I have no way to prove what he claimed is incorrect. The witnesses all verified his claim, so there is no way I can disprove it. I can't stop thinking about it but my husband insists he did nothing with this old, ugly woman, and keeps saying how much he loves me. Any insight? Should I ask him more questions? Should I just trust him and drop it?

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