I love my boyfriend but he's turned jealous and it's my fault...

I am in my 20's and really in love. I have been with my boyfriend for 4 years with a break where we split after 2. We split because I found out some of the things he'd said about himself weren't true. We kept in touch however and decided to give it a go. When we split up he saw someone else I never did. The most I did was meet up with a male friend for drinks. When I told him this he asked me to stop speaking to me. I agreed because I wanted our relationship to work and he wasn't much of a friend anyway so it wasn't a great loss for what I saw as a big gain. My friend however then got a job in China and I messaged him to congratulate him. My boyfriend saw this due to me leaving my iPad at his house. He was not happy and said he could not longer trust me because I broke his promise but he still wanted to be with me. Then my sister joking signed me up to love island which I thought was funny and posted a picture of. He flew off about this and said it wasn't funny he didn't trust me and I was to leave him alone.... This was 3 days ago I've heard nothing. I don't know what to do because I did break my promise and message the friend but I didn't cheat or lie and I can't stop other people from doing things. Please help