My girlfriend left me to study in the UK. I still can’t wait.

It depends on the situation. Let's analyze it. The UK is an island country, not a country of immigrants. It takes 10 years for permanent residence, and the policies will definitely become more stringent after Aunt May comes to power. So it is difficult for her to immigrate.

If she goes to high school (2 years)/undergraduate degree (3 years), it will take 3-5 years. Recommendations don't wait.

If she joins Top Up in the UK for her junior year, it will take 1 year. Can wait.

If she studies for a master's degree, it will take 1 year. Can wait.

If you are studying for a PhD, it will take 3 years. Recommendations don't wait.