Honest opinion?

Hey guys so I need some honest opinion on this because it’s been messing with me and I need to have some advice but kinda have no friends to go to about this... so I’m in a relationship with my bf who’s amazing and all and we’ve talked about a future together and everything but the problem is me. So I’ll randomly start thinking if I’d be better off not being in a relationship sometimes and I get jealous easily (neverr show it tho) but if he mentions a friend that’s a girl or if I think about his exes i’ll get upset and idk why I’m like this or have these thoughts but I get sooo annoyed with myself and wonder if it’s like this for every relationship or if I need like therapy or something?? Like I know everyone has insecurities but why do mine make me want to solve it by breaking up with him?? I love him but what can I do to stop??