seriously...
looks like: -

1. She's seeing someone else
2. You were the rebound, i got no friends so basically i'm finding it convenient guy friend. and she just came back from the Great country UK
3. She don't see herself with you for too long and just played along.

When a girl refuses to acknowledge you in Public, at first might seem like shyness which is true. But 2 years! That's like feeling embarrassed to be seen with you.
You love her that much, she should be proud to be with you

Bloody immature girl.
Selfish and self centered.

My advice?
Take 10% of your savings and splurge on YOURSELF
Be it clothes, entertainment, electronics.
Just make yourself feel good.

Then once you feel better then think again if you really want this.
Talk to friends, hang out, do what ppl do... Don't STAY AT HOME. You'll drown
Don't contact her for the moment.

You can try after a few days but don't keep doing it.
If she loves you, she'll come to her senses but make sure if that happens, she not afraid to show that you are her BF. If things stays the same. Forget it.
It has happened once, it will happen again.