There has been a big debate about the use of marijuana when it comes to both mental and physical health challenges. When it's used for medical purposes it's used in certain ways that extract some benefits from the plant thought to be helpful and it's not typically like buying it off the street for recreational purposes as the marijuana sold today has a much higher dose of THC which causes people to get very high and it's more addictive and the level of THC can be different depending on where someone buys it and where it was grown. Too much THC can cause a person to experience a psychotic episode. Some are more sensitive than others to how the THC can affect their brain. Studies of early use has proved to discover it can affect the sensitive area of the brain that is used for decision making and learning.

When someone is using drugs, they can be mellow and easy going one minute and angry and moody and short tempered the next. In short, you are not dealing with someone that is consistently available in a "healthy" way. You are asking how someone can be ok with hurting another person, well, they are not functioning normally and are often very drug dependent and their lives revolve around the drug use. Males often experience sexual problems and can't perform and engage normally. You are really not getting a NORMAL healthy person. There are many narcissistic charateristics and behaviors that present with alcohol and drug dependent individuals.

Even if they stop using, they have to spend a lot of time learning how to live their lives without drug and alcohol use. Many of these individuals are very immature for their age and have to literally learn HOW to engage as a grown up.

So honestly you are much better off completely disconnecting from this guy.