EX in love with my bestfriend

i dated this guy for a year and through misunderstandings we broke up, i was heartbroken, i continued to like him even though we broke up but i guess he stopped liking me. his friend told me he likes my best friend and to stop liking him, im trying to stop liking him but i just cant, every time he talks to my best friend it hurts my heart. after me and him broke up my bestfriend and ex got closer, however my bestfriend says she dosent like him but still is really flirty towards him. my ex started asked me (his exgirlfriend) how to get my bestfriend to like him, i was soo done at that moment, how would you even dare to ask that.i asked why are you asking me and he said its because i copy her personality so im like another version of her. i was sooo heartbroken at that moment because hes known me for 2 years and her for a couple months, how can he say that i copy her personality. the thing is im insecure and its like he just replaced me with someone who looks better but had the same similary personality. what do i do? how do i handle this situation im in? how can i not care about him? i want to be okay with him liking my bestfriend

Explain how you feel to your best friend and ask her to maybe back off from him. If she's a good friend and cares about you and your feelings she'll understand and do what you ask particularly if she ain't interested in him

Tell your friend how you feel and what he said. If someone said that to my friend I would think he is a complete ********. I know its hard, but you need to stop liking him. Everytime you think about him do something else, stop talking to him on social media *if you do, jut try and forget him. But do tell you friend that you want her to stop flirting or being so close to him. If she is a true friend she will understand