she's suddenly become very distant, what should i do?

She probably does not like you but is too nice to tell you directly.

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but this doesn't make sense considering the way she acted when i last saw her, she wouldn't have had me round to hers and let me sleep over etc. she was really affectionate

been seeing this girl for a few months now, things have been great really. We have a good time together.

Anyway, since we last met the texts have been very short and not the same at all. I have had to initiate conversations when she would usually text me every day. She also claims to be busy and weirdly asked if i was free during the day anytime. I won't see her for a week which is strange.

I should say the only issue we've had recently was the past few times we've tried to have sex i had performance anxiety. She said this wasn't an issue and she told me when we were first going out that she had anxiety herself and used to have depression (so i believe she isn't bothered by it)

I'm really not sure what to do now?

make up for it with your fingers and your tongue, if you do see her again

She lied to make you feel better. Now she's ignoring you, it's her way of being kind. What you do is do nothing, back off and hope she doesn't do anything stupid and then get a grip and next time you meet give her something to think about.

Alternatively, leave prematurely (get it) and find someone who won't ignore you the second you start showing weakness. They don't make very good partners.