How do I go on with my life?

I've kissed other lips...
I've touched other guys...
and now it makes me wonder why...
Why did I f**king do this?!
Why did I f**king care?!
I guess I just always thought that you would be there.
Now you've gotten me in love with something I cant see...
I just thought we would always be.
You've gotten me torn up inside; and I dont know how im supposed to let you go.
How do I say goodbye to the memories we made?
How do I go on living another day?