Have you ever been cheated on?

My goodness yes, I loved him so much. We had just got back from an amazing weekend camping, and when we got home I was bored so I started playing games on his phone. Then this message popped up from this girl and I had no idea what she was talking about so I went and looked at his sent messages and he had sent her one saying “when I get home I have some flowers for you babe” I was so upset, I still think about it today. Anyways, my mom was sitting in the living room when I saw that, and he was upstairs in the bathroom. I ran down to my basement and started bawling. My mom ran after me and asked what was wrong so I told her. She went upstairs and made him leave and she goes “you NEVER cheat on my daughter” and he was gone and I never want to hear from him ever again. It took so long to move on, but I did. It still effects me today, I love my boyfriend I have now so much. We have been together for 4 months. Hes everything to me, but I’m still scared of getting cheated on because of my ex.