Sickly feeling when speaking to a guy

My first boyfriend/sexual partner broke up with me over 5 months ago. We were not together long, but I felt a lot for him and was crushed when it was over. After the break up we were friends with benefits - it has recently ended. Ive started talking to an old friend who has always fancied me and he's been flirting with me. I find him good looking and he's a nice guy, but I get a sickly feeling in my stomach and get the urge to speak to my ex again.. is that normal? is it just because im not ready to move on? thanks.

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