perception

I was 18 years old when i found a girl that I liked .I perceived her as a honest person that was working towards creating a better future for herself. We went out for several weeks. After several weeks of going out i figured out that she had a small addition problem with weed and LSD. She had stopped with the LSD due to a bad trip but refused to totally stop weed.One day her sister called me, and she told me that she was not only cheating on me she had a fake ID and was lying about her age. I was shocked I found out the person she was going out with behind my back and we talked and it was confirmed so I left her.I was very surprised when i found out that she was cheating and she honestly left me very insecure but she taught me the lesson be careful with your trust.