My girlfriend hasn't had sex with me in a year but still says she's interested in me, what to do?

Ask her to prove her feelings physically.

Tell her sex is important to you and so you need to know if it's ever going to be a part of your relationship.

Mate why you still with her??? No sex after a year? If I ain't had it in a week I ask her what's up haha

Honestly I'd have been getting to the root of the problem a month in. It's too late. Either she is cheating or she doesn't like sex. If this is something you value I'd break up.

marry her of course ...........