tl;dr Ex girlfriend moved in with me, how do I stop feelings

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tl;dr Ex girlfriend moved in with me, how do I stop feelings cropping up again?

>dated for 4 years, broke up when she fell in love with another guy
>cut off contact with her and went into a spiral of drinking and fucking for a year
>got my life in order, started working and got my own place
>3 years later she gets in contact and her life has gone to shit
>broke up with the guy, started cutting, got thrown out by her mom, started drinking
>not sure why, guess I still love her a bit so I took her in as long as she cleans the place up until she can get back on her feet
>It's been 6 months since then and it's almost like we're dating
>watching movies together, playing games together and shit
>when she gets drunk she sometimes comes into my room and falls asleep next to me

How do I stop myself from falling in love with her again? I sort of like her, but don't want to go down that path again. The guy she fell in love with still loves her and flirts with her and sends her dick pics, but she laughs at them when she shows me. I can't throw her out as she has nowhere else to go, but I can't really date someone else if she's still living with me.