Well I have been with my boyfriend for 5 years. We have lived together for 4.Last year he got a DUI and pot charges and has been on probation and having to take random drug tests twice a month. this past year has been great. Despite the financial part we have grown so much as a couple. We used to drink constantly but since his arrest we both stopped and our lives are just so much better. But recently my brother told my parents that he has smoked and drank with him a couple times this past year. My boyfriend denies it saying he is doing good and my brother is making shit up. He has passed all his tests and i haven't found or smelled anything on him but my boyfriend has lied about his marijuana use in the past so I don't know what to think. I don't know what my brother could possibly gain by saying this...I don't know what to do