How to not be a jealous girlfriend ?

im a very jealous person even if it's not about my boyfriend, it could be about like my cousin getting this new purse or whatever... The only reason why i'm jealous is because i got fucked over so million times, and i can't forget those times because they were so awful i felt like commiting suscide . anyways me and my boyfriend always fight because i don't want him to be social with other females but me. But i want to not give a fuck and if he wants to socialize with them then i won't care but i do care .. I just don't want to be fucked over again for the 40th time. im not insecure , i do love myself but i just don't trust anyone and get jealous 😕 any got any tips..