Hello Erecura. Interesting post! Thank you for sharing and sorry you've been dealing with a confusing situation. Sounds like you have a passion or dream which is calling to you! In general, research later in life suggests that people tend to regret more the things they never tried as opposed to the things they did try (even if those things didn't work out).
I have a hunch that you know what you want...you are maybe seeking reassurance? Is that right? If your bf is not following through on promises and not interested in the future you want (moving abroad) then I think life may be guiding you along here. Have you had a non-confrontational but direct conversation with your bf about your feelings about the current situation etc? I believe that happiness starts with the Self. We need to find and build our own happiness. We can certainly share it with others but they cannot create our happiness for us. So, if you are not happy staying in your country then...I think you can decide that for yourself.
Travel is exciting, enriching, and mind-broadening! If you decide to go, I wish you many happy adventures! I don't know if you are possibly considering emigrating (as opposed to temp study abroad) but speaking from my own experience I can tell you that it is a unique experience with it's own rewards and challenges. On a point of accuracy, I should point out that several comments on this thread about immigration and the U.S.A. are not accurate. Just a heads up for you.
One more thought: when we move to a new place (country or otherwise) we are bringing our past hurts and struggles with us. A new environment can be a wonderful opportunity to grow...it's just helpful to keep in mind that the prior problems won't necessarily evaporate on new turf iif you know what I mean. Personally, my road as an immigrant has not been an easy one and it has taken a lot of hard work but I've never looked back and my life is infinitely better than the one I had in my homeland. But that's just me. Everyone is unique. You don't know until you try
Whatever you decide, peace and positive energy to you!