Lying

My boyfriend has been not taking he’s medication for he’s anxiety and depression because I can tell when he’s not taking them he gets very rude and grumpy and uses the silent treatment well today he lied to me about taking them it’s not the first time he’s lied to me about other things either just needed to rant here because idk what to do.. we also been fighting a lot too he’s flirted with other girls in the past so cheating and he’s just seems more annoyed with me as of lately and it’s not good for my mental health ..