Why do I feel so betrayed after my breakup?

My friend, now ex gf, said she wanted to stay with me, and was willing to stay and get married. 'SHE WAS SURE' she said, we dated for nearly two months before she broke it off, via text, and was heart broken! She was so sure! I felt so betrayed and I'm still feeling depressed, insecure, and betrayed after three weeks. I feel cheated, she broke trust I thought we had. Me and her are just teenagers, maybe this just part of teenage life, but I felt it was so real.

Two months and teenagers and talking about getting married? Wow...you've suffered a teenage heart break and yes it hurts. You will survive and you will go on to have other girlfriends and in time when you have grown and matured you will find the right one for you. Yes right now it's teenage life.

Stop talking to her. Do not try to be friends. Be polite at school, but make new friends and date other girls.

My friend, now ex gf, said she wanted to stay with me, and was willing to stay and get married.