Trust issues

I just recently found out my boyfriend of almost 2 years relapsed.. When we first got together he got clean but early August his sister was hospitalized with covid and is still in the hospital on ventilator not getting better. He has hid it from me for 2 months. I have been having gut feelings that something was wrong and I initially thought he was cheating. I don't believe in going through his phone but I told myself I needed to know and if he was I was going to leave well I found out he was using again. He confessed to it and said he would stop. But now I don't trust him with anything. I went through his phone again and now seen that his ex wife was at the hospital visiting his sister while he was there and he didn't even mention it to me. She asked him if he was there cause she was going to go down and talk him. I can't help to think something feels off with it. But I feel horrible because I know he is going through so much with the possibility of his sister not making it. I don't know what to do. Should I leave it alone or ask him about it. Why wouldn't he tell me? He told me about other people being there. I wasn't there because he need me to take the kids to church and after school games. I feel lost.