Jealous of his exes

I am currently in a long distance relationship with my boyfriend.. we live in different countries.

he is my first boyfriend.. and the first person I’ve ever been in love with..

he loves me a lot.. I know he does.. everything he does and says to me confirms it daily.. he is even going to move near me next year so we could be together.. everything about our relationship is overall great except for the fact that we can’t be together yet..

There are still some insecurities in me though.. that I sometimes can’t fight..

He is older than me.. and he has already had a few girlfriends.. the last relationship he had lasted 5 years.. and he is still even friends with that ex..

He tells me a lot of sweet things and stuff that he would like to do once we are together.. it’s all very lovely.. but.. from time to time.. even when he says those things I can’t stop thinking.. he has already done all those things he wants to do with me with other women.. I can’t stop thinking how he was with them.. specially that last ex who he was together with for a long time..

I just can’t stop thinking how he has loved someone else before me..

now logically I know it’s stupid.. he is with me.. he loves me.. there was a reason the relationships with those other women didn’t last..it wasn’t so perfect either..

But inside me.. i still feel a bit bad.. like yesterday too.. he was telling me how amazing it’ll be once we are together and he was telling me how much better it’ll all feel when we can hug and kiss etc.. and he told me that he knows I don’t know how it feels but its great.. and alI could think about was “yeah.. I don’t know.. but you sure know all about it.. since you’ve already felt all those amazing feelings with other women “

I know how stupid and childish what I feel is.. so obviously i can’t say anything about this to him.. i just had to talk about it somewhere..

I think the main reason I feel these things is because I haven’t been in a relationship before.. I’m sure if I had been in one before.. it would be very different.. I’d understand him and wouldn’t mind any of this stuff the way I do now.. logically I know it..

But does anyone know if there’s anything I can say to myself to make these stupid thoughts go away? I keep telling myself that it’s stupid and he loves me and all of that other stuff is in the past.. but it’s still hard..