I need help!!! I'm very upset

Ok so my boyfriend and I have been together for a while now and today he told me that he did drugs (shrooms) for the first time and I've made it very clear that I didn't want someone who did drugs and he did it anyway. I need advice, motivation, anything. I feel so angry and sad because I didn't want me and him to end but I feel like I shouldn't have to settle for less. I just need some advice help! Thank you.