Do I have the right to be upset?

I dated my ex boyfriend for 6 years from the age of 15-21. We practically grew up together. I did something I deeply regret and cheated on him a few times with the same guy. Well I confessed to my sister and my sister told my boyfriend what I’d done. This strained my sister and i’s relationship forever. Well it’s been a year later, my (ex) boyfriend broke up with me and I haven’t spoken to him at all and I’ve just found out through family members that my sister is dating my ex boyfriend and has been for 6 months and he apparently is in love with her and vice versa. Apparently after she told on me they grew really close. I am devastated and pissed. My mom basically told me I have no right to be upset because I cheated on him thus throwing away the relationship. am I right to be pissed?

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