Search Results: i like her but am hung up on ex girlfriend

We live 7000 miles away (I'm in Asia and my boyfriend lives in Europe). I have been in this so called relationship for 1.5 years, we both have visited each other in each our countries and we always plan ahead when is the next visit.

But my main problem here is up to this point I do not believe in long distance relationships and I have trust issues. I kept going because my boyfriend is a genuinely nice person and he's willing to do anything to make it work and for us to be together in the future, which is why I want to believe that this will work. But there will always be a part of me that keeps on saying it will all end one day. Furthermore, knowing or having heard of all these people whom had been unfaithful to their partners, whether they live near or far, (I have also accidentally been the side chick a few times), I don't believe that there are men out there who are completely faithful to their partners. Not to mention the first time we met he was still hung up on his ex girlfriend, whom he sometimes still sees since they are in the same circle of friends.

These had been the biggest issues between us and I have tried to break up for these reasons several times. I always ask him if he had ever cheated on me or if he ever had any attraction for someone else. I've also accused him of still having feelings for his ex girlfriend. He kept telling me he had never done or felt such thing. As far as I know he had never lied to me and he had never mistreated me.
I know I might be insecure but I really cannot ignore these thoughts of him being unfaithful.

I really don't know what to do. I need some insights!