My ex boyfriend has been calling me lately, what should I do?

Anonymous
Me and my ex broke up a long time ago(3 years specific) we remained as casual friends,while in our relationship we didn't had sex, first time we had sex out of our relationship was a year ago he already had a baby with someone else. He has a girlfriend but lately he has been calling me every night and telling me that we should hang out go see a movie or go to the beach I don't know what to do or what to tell him, I appreciate him very much but I am afraid to love him again or getting intimate with him while we are together alone.
Updates
+1 y
Thanks 4 the Advice guys btw I missed a tiny tiny detail...I don't know If it contributes to my question...before being my boyfriend he was my best friend since Middle School now we are both in college...
My ex boyfriend has been calling me lately, what should I do?
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