Do I accept her request?

Hey, so 3-4 months the girl I was dating left me, she said her feelings for me had gone and things weren't progressing like she hoped. We'd known each other for 2 years. She deleted me from Facebook and we cut contact out completely. So out of the blue 4 months later she's added me on FB again. She's left me 3 times now (I kept wanting to give things another go) but this time I told her I'm done and we should go our separate ways as I don't want friendship as it'll be too complicated. Do I accept her request or let her know I don't want to be friends? I've just started to get back into the whole dating game again.
Do I accept her request?
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