<human>: So my boyfriend [20m] and I [20f] have had a great relationship. Cut a long story short I found out his ex had text him twice since we'd been going out (we've been going out over a year) and he says it was just chat, her asking how he was, how his family was, how I was (which is weird because she's a b***h) and so he just replied to be polite and because he thought nothing of it. 

However, I've told him in the past how paranoid and insecure I am because I've had guys who've been after me for one thing... I also know how many people cheat nowadays... Anyway, he knows how I feel about his ex and because of this he didn't tell me she text him, in fact he deleted the messages worried that I'd freak out if I found them. 

One night we had an argument and this ended up coming out. I was furious. And the fact he'd kept it secret means I feel like I can't trust him anymore and I need to learn to trust him again. Apart from his past (and the fact he would talk a lot about his ex at the start of the relationship because he read online that it was 'healthy' to do) he's the perfect boyfriend. We have so much fun together and we both love each other. I desperately want to completely trust him again and be sure that he will tell me if she contacts him again just so I'm aware of what's going on. I don't mind friendly chat but she's manipulative and attention seeking so I can't help but think she has an ulterior motive...

What can be done for me to be able to trust him again?

Can you condense the text into a few key points?
<bot>: boyfriend thought he was protecting me by hiding 'friendly messages' from his ex and I want to be able to trust again.