missing my ex

I'm currently in a relationship with someone who treats me better than anyone ever has but for some reason I cant get my ex out of my head. This makes me feel horrible because I know my boyfriend loves and cares about me but I still think I love my ex and I don't want to! I want to love my boyfriend :( I'm just stressed out by all this because my relationship is long distance and my ex is moving back into my town soon and I can't help but want to go and beg him back, I won't do it but is it shitty of me to feel this way?