My ex just told me he's still in love with me 🙃

Gr
I'm not sure if I should tell my boyfriend or not. We tell each other everything 🤔 
I need some advice 
(They know each other. My ex knows that I am planning to marry. He also has a girlfriend of which he is in love with) 
I've just recently talked to my boyfriend about being friends with ex and he's okay with it but now I know he still loves me.