HE LIED 😨😨😨

so my boyfriend of 3 years has had some drinking issues in the past. it was under control for a while. then his mom passed and he lied to me. he said he wasnt drinking but he was drinking behind my back. I've asked him multiple times and hes lied to me multiple times about it. the only reason he came clean is because I was filing his bank statements and saw that he was going to the liquor store since January meanwhile he claims that he hasn't had a drink since April. the statements say he went there January to June. his mom passed in may. I called him out and he lied then yesterday came clean. what do I do? i feel hurt because it was a slap in the face and i dont know if I trust him anymore. please help I'm going crazy!!!