What is my boyfriend doing?

Ok so..... I was looking up chigger bites on my phone and it died, I picked up my boyfriends phone and went to google and before I could type anything in, it immediately said " how to make MDMA" " how to make dmt" "easy meth recipe" " how to get high off household items" and " smoking vyvanse capels". I confronted him about it and he got really mad and said he was looking up random things. I don't think that he was just randomly look those kinds of thing up. Anyone else think he's doing something he's not telling me? He is now leaving my house because he is so mad. I think that's a weird reaction for just a random look up.