Hi Zia & family,
Well, you're young so first off - be kind to yourself & stay open. Relationships of ANY type are seldom if ever "effortless" and you are starting out dabbling in a type that's even more difficult.
Take a deep breath - keep you head clear - and try to avoid emotionally driven thinking/reactions.
A couple foundational thoughts here may be of some help to you all.
1> "Love" comes in many forms. Not all loves are equal in intensity or reciprocation. Accept that.
2> Little in life is permanent. Regardless of how much joy or pain any particular situation brings to our lives, we have to acknowledge going in that it may, or will likely, not last forever. Drink in the joyfullness while it's present and know down deep that in the worst case it will leave you with warm memories to cuddle with at other times in your life.
3> It's been said that there are only 2 rules in life.............
a)Lessons will be presented
b)Those lessons will be repeated until they are learned
Be comfortable in the fact that in whatever choice you make - a lesson will be learned. Open to the lesson. Try not to have it repeated.
4> You may or may not believe in or embrace the concepts now popularly known as 'synchronicity'. The concept that things that circumstances appearing to us in our life are there for a reason, and that there is some underlying thread that we need to follow for our own evolution as a person. Some will say this is the "request we published to the universe" and that this is the response to that request.
Regardless of your beliefs, it has been, and is, an established fact for many, many people and sometimes is the only way to stay sane (?) when all the life choices are presented to us. You have to learn to breath deep and go with your "gut".
Your concept of a (at least temporary) divorce for the purpose of obtaining legal citizenship for your SO, while technically feasible is fraught with risk. These are the type of things that spread the horror stories that make many people shy away from attempting such a lifestyle in the first place. Drama & complexity - nobody wants it. Be careful.......