Guys, how do you decide which girls are one night stand material or relationship material?

Do guys usually know right away which girls they would want a relationship with and which girls they would only have sex with? Is it possible to change a guy's mind from seeing someone as a one night stand to girlfriend material? My boyfriend had a lot of one night stands and he told me that he would ignore them if they tried to text him the day after but with me, he was so gentleman-like from the very start like a completely different person so why did he treat those girls so differently?
Guys, how do you decide which girls are one night stand material or relationship material?
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