Drugs?

So my boyfriend and I have been dating for 2 years and hes been smoking weed years before we even met, I dont have a problem with weed because I smoke too sometimes right. So he tried shrooms like over 10 times while we've been together, again, I dont have a problem with it but I wouldn't do it. Yesterday he tells me he wants to try dmt because it's natural and comes from plants just like weed and shrooms do. I'm not really okay with that. Because it was weed, then shrooms ,now dmt then what? He says it's only cause it's natural and won't do like lsd or any of that other shit but it worries me because his dad had a drug problem when he was younger and my boyfriend always says hes not like that and won't get like that but like really? I'm not okay with it.

Opinions?

I'm just worried that he doesn't and won't tell me because I dont like it but I'd really rather have him tell me about it then keep it a secret.