If I say I don't have the hots for my guy friend then why do I get that feeling in my stomach and my heart pounds a bit when I see him?

My friends tell me I have the hots for him but I really don't so how come I get that feeling in my stomach when I see him. My ex-boyfriend's I've had then treat me right and treat me like crap. My friend said I should stop going after guys that don't give a shut and go for guy friend. They also said I blush when I see him which is so not true. I'm afraid to get into another relationship I admit and I'm scared of getting hurt. Even my guy friend said I'm so scared of getting hurt that I refuse to let someone in my heart. Also I'll also miss out on a great relationship and I shouldn't be afraid to take risks.