Advice please :(?

I had a boyfriend of 4 years he treated me very badly during 3 years and I was still with him. He also did a lot of good stuff but the negative outweighs the positive. I decided to break up with him in September 2022 and 2 months later he got another girlfriend. I was so nice to him I did everything for him and was very forgiving I forgave him for moving on so quick from the relationship that lasted 4 years in which he fucked up with me. The other day we were talking normal about school and stuff college and he texted me and said guess who I spoke too. Then I’m like who then he’s like Maria ( fake name). This girl “maria” was a person who he takes shit about one of his girl friends and one of the reasons we split up before a year ago. I am over him I don’t really care who he talkedbto anymore he has a whole new girlfriend I’m not jealous but for me it felt so humiliating him talking yo someone that caused me so much hurt. How would you feel if you ex started talking to someone else that they talked shit about you to and this person hurt you so much. Isisnt it disrespectful to me like I was your best friend for 4 years bro don’t you have any consideration for my feelings? What do you think?
Advice please :(?
Post Opinion