LOL WTF HELP

So I've only had sex with one guy and it was last semester. I am a fr in college if you wanted my age range. And I fell in love w him and basically he left. I want to have sex with someone I really like right now but I know we won't be together even though we've been talking and been sexual since January. But I know I'll get attached. How do I just not get feelings for this guy!?