My boyfriend is friends with the girl he liked alot and i cant take it?

im samantha im 18 and my boyfriend is 19. me and my boyfriend have been together for almost 2 years now he is the best boyfriend in the world, hes sweet, loving, caring, dose not lie, we have been friends for so long and all of the above but one thing bothers me about him his friend, and his friend is a girl shes cute, she wants to be a Model so she module's, haves a good personality and more... he liked her Alto in middle school and high school, he try-ed to date her when we where not tog-her and she said no, then she try-ed to date him and he said no, but when me and him got together, they would talk all the time, and it bugged me... how they talked to each other sounded like flirty talk. like ( i miss you, i want to hang out soon, u look hot in this pic, and Alto more)... and i seen his old comments when we where not together and it was not a happy site for me to see he said( u look naked yum mm and Alto more.. i asked him why are u guys flirting he said that's just how we talk to each other... hell no, friends don't talk like that only if they like each other, i never liked her in the first place, we would always fight because i did not want him to be her friend... one day he st-oped talking to her and i felt Alto better, i would asks him if u like her he would say no shes ugly, shes annoying and much more, but i still thought he was talking to her, so i would always start a fight.. so he broke up with me.. when we where not together my friend said he was talking to her for 2 weeks behind your back, then he left you.. so i got pissed and i told my ex i hate u, your the worst boy friend ever and Alto more, and i picked a fight with her too...after all that happened i said sorry to my ex and her, and my ex did not wont me to talk to her, but i did anyway, 4 mouths went by and me and him where together again, and i told him i will do my best to escaped it, but i cant and its hard to, so i try ed to talk to him about it and i said its bothering me again that u guys are friends, and i told him how i feel about the hole thing, and he said im going to be her friend,and your just mad because im holding my gr owed, and he said if she text es,calls me, or writes me im talking to her. im not trying to fight i just dont want her to be his friend.. so now it does not feel like he cares about how i feel about this hole thing... i love him Alto but i don't like her, and i cant take it no more, hes not giving her up, i would do anything for him but he will not, hes done it be for i don't get it, its like he really needs her in his life WTF... help me places...