Buffy with Riley but being abused. He is injecting her with something so she loses her Slayer power.

Buffy and Riley run into Spike in a diner. Spike sees Riley abuse Buffy, rescues her, and takes her to his apartment. Buffy is very underweight (Riley kept on her about her weight and being fat).

this isnt me by natalie elizabeth dont know how to do links but i found it on ff.net

This Isn't Me by Natalie Elizabeth

Buffy is married Reily who is abusive. Spike becomes the unlikely hero and rescues Buffy. COMPLETE

Thank you, summers375. I was interested in reading this.
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Guess it's found then since the OP hasn't replied