It's not sust per se. I have taken over a gram of sust a few times (3) for 8-16 wks and I have not ended any relationships, made any bad decisions, messed with my head etc. I actually am euphoric and achievement oriented on cycle. I get a little down going off cycle -- that's all. It's like alcohol, marijuana, lsd, or any other drug, the reaction depends on the person and their issues. Roid rage is real, because it has happened. Also, people "going crazy" on LSD is real and has happened. But I've also tripped 50 times as a kid and never had any problems. Basically it can serve as a trigger for mental problems or psychological issues. Besides, except for pointless guilt, you probably didn't want to be in that relationship you broke anyway, but just didn't want to face those feelings, and the lust for the other was there too. But it's all there whether you're looking at it or not, so just let it be, and don't convince yourself you are "losing it" just because you are living outside of the box you put yourself in. Try to have fun, hurt no one, and forget regret. My 2 cents. But if you can't have fun on cycle or at least manage the negatives, probably better to stay away.