How to deal with this

I was cheated on in a previous relationship and have recently entered a new relationship after 2 years of being single. It was only after being in a relationship again that I realised I had trust issues from my last boyfriend. Since realising this, I’ve been trying to work on my insecurities as I don’t want it ruining my new relationship but because it’s only been a few months, I’m not perfect though am getting better.Whenever I mention my insecurity to my boyfriend, he asks for space for days at a time as he gets upset that I don’t fully trust him yet. The most recent one was 2 days of space over me asking a question because I was insecure and just needed reassurance. I explained that I don’t do this intentionally.I find it difficult as I like to deal with issues ASAP instead of dragging them on. Though I do accept I need to work on my insecurities, I do also wish my boyfriend was more understanding and patient as he knows what happened to me in the past. I wish I was able to openly show my emotions and ask for reassurance on the rare occasion and then be reassured. I feel scared to mention my thoughts when he shuts me off for a day+ instead of talking about it.Other than that we have no other issues. The first time I told him about what happened he said I could go through his phone and he had nothing to hide. So it’s not like he’s actually doing anything suspicious, I just wish he had more patience whilst I work on this and accept me for who I am.What should I do how should I deal with this?