what to do

Kyria
So I knew my bf for 21 years dated on and off for 8 years now we broke up cuz he choose his ex and female friends over me before we started going out this family friend was trying to talk to him but he wasn't interested cuz he like me but I found out they were secretly texting and I told him how I felt so now we are broken up and my ex was there and the family friend too  so now I overheard them talking about how he texted her and she didn't answer and she asked him if he texted the right number me and this family friend were best friends and we had fallen out and my ex knew about it but I just don't get how right after we broke up he decide to text to her and he was texting her before we broke up I don't know what to feel