I need YOUR help

HI,
i really need your help if you understand smoething about horses, especially young horses.
i posted some photos of Adlerflug the 11year old upperaustrian haflinger gelding.(and the horse at the photo is him)

we have a big problem that might end some day with a dangerous situation. we cant trust each other!!!!!! it fells like there is a big wall bewteen us and he is too scared to jump over it and i cant climb over it. i just cant reach this horse we are no team

it might be dangerous because we just can ride on a street outside there is no fence... nothing... if he runs away he can run where he wants and at this street are people and cars not always but sometimes.

and if you think i should work with him in a round pen we dont have any, we dont have a place to ride with a fence around and we just have a pasture with a fence but it is very steep so.... we have no place to work

please help me i dont know what to do
if you have a serios answer you can write me an email:
neisti.girl@gmail.com
or
leonie.schmidjell@aon.at

THANK YOU!!!!!