Is it okay if he's still friends with his ex?

My boyfriend is in a platonic relationship with his ex, although I don't mind that because she's getting married to someone else, but the marriage is happening against her will.. My boyfriend said that he was upset and worried about her because they were best friends since they were 10 years old, and he said that he can't see her upset, she's sacrificing her life.. He sent me a picture of her and I replied by saying that she's actually very pretty, he agreed to it and said that he knows it and he was madly in love with her, but he even said that he no longer has feelings for her, the only person he loves now, is me.. I got a little insecure because I felt his ex was way too prettier than me, and alos how easily he said that he was madly in love with her.. Should I be upset about it, or should I act normal?

Is it okay if he's still friends with his ex?
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