Am I secretly still in love with my ex boyfriend?

My ex and I were together for close to 4 years... we had a child together, and I realized that he wasnt good for me so I split with him and he split on my daughter. 2 years have gone by and I am currently been dating my bf for 1 year or so... I have had trouble opening up with him... it took me up to 8 months for me to tell him I loved him and it still felt a bit weird. The thing is I have never felt the way I did about my ex... and I miss that feeling. Recently my ex got in contact with me wanting to be involved in my daughters life.. she is three and he now lives a few provinces away. But is coming back in a few months. I allowed them to talk on the phone, which lead to me talking to him... he seems to have changed a lot since the last I heard from him.. and I felt this heart flutter while talking to him. I just have this sense of comfort with him. I dont want to like him... but I feel like I cant help it. I kinda sorta miss him. UGHHH whyyyyy!??? Is this just a faze is this normal to feel this way? I have a boyfriend that I care about so feeling like this goes against everything I believe in. HELP!!