Update: Am I tripping or he's cheating?

I've attached the previous post to this update. It's a small one. Nothing too crazy happened but... it took my fiance about 3 days to realize I was serious about our situation and we talked again & basically said it was over since I can't trust him but I don't think he believed it. He's still trying to persuade me he did nothing. I told him if that was the case, his first order of business would have been to call the girl out the blue and let us talk (the first time i confronted him he told me he was gonna call her). He never did but this time he claimed he would he would the next day. I didn't wait though. I ended up sending her a message and this is how the conversation went. Now I will say that initially, I took her word for it. It seemed genuine and I honestly felt better about the situation but... I've become extremely insecure & checked his phone that night. When i first texted her, she immediately texted my fiance and said "hey why is (my name) texting me?" 10 minutes later is when she replied to me. I didn't see a response from him or a call to her so that left me with 2 things: either he called her and gave her the run-down then deleted it, or he just ignored her text. Either/or could be the case but now i feel like when I read the messages from her, there are portions where i feel she's trying too hard to make him seem innocent & the fact that nobody can tell me what "i need it 😍" means is upsetting me. So now where i was ready to begin repairing our relationship, i am now back at Square one where I don't believe him and want nothing to do with him. The truth is, I'll never know the truth for real & idk if i can deal with that & sweep this under the rug.

Link (idk if you guys can click it or not but I couldn't insert the photos and the link. Or just look up the post name

https://www.reddit.com/r/cheatingexposed/comments/1hyb1w8/am_i_tripping_or_hes_cheating/