How do i not hurt her?

Well there's this girl that i think likes me...?? She kinda gave me the hint she wanted me to take her home on her birthday but i didn't. Well i like her but i'm sexually frustrated and i know i'll try to bed her if we end up alone. However she's a nice girl and i don't think i want a relationship so i didn't pursue her for a long time. We just say hi and talk when we see each other. What should i do?