My boyfriend is assuming

So I have been with that guy for 5 years.
It is a distance relationship he lives in the usa and I live in germany.
I'm 18 now and he is 24... yeah i know I was only 13 when I met him.
We always had little fights. I guess its normal when you are so far away from eachother.
We have only met once in real this year and it was perfect.
I actually quit school for him cause I wanted to fly back with him to the usa when he was here. (we wanted to marry)
but I couldnt do it because I didnt feel ready to leave my parents and stuff

After he went back to the usa we contiued talking and promised we would still stay togheter
a few weeks later he would assume that I'm chatting to guys
(I used to chat to a guy as friends tho and since then he is always assuming)
I've apologized alot but he never seems to get over it
I never loved anyone else beside him but he doesnt belive me.
then he started calling me names like whore and stuff out of the blue (while we were together)
He also thinks that I didnt fly back with him because I dont love him
I'm really insecure and shy i barly leave the house nor am i talking to anyone but he thinks i'm the complete opposite
I cry and it hurts me that he is thinking like that of me but he just doesnt believe me
I know he loves me but he is 100% sure that I'm using him
I'm not.
We just broke up.. but somehow we always end up talking anyway
I should problaby let go but I cant and I know he cant either but he doesnt even accept my love
maybe he cant handle the distance
i dont get it...
(I should problaby mention he had sevarel exs and they all cheated on him if he says the truth. Maybe he was also assuming he same about them tho who knows...)
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What do you guys think of that is it normal?
I'm sorry if this is long and too much drama xD