My boyfriend has a lot of female friends...

My boyfriend and I have know each other for going on 3 years now and have been together almost a year. I love him to death BUT he has a god awful about of female friends and most if not all are his ex's or friends he has fooled around with in the past... It bothers me to no end that he texts and communicates with them often and I have told him this. But I can't just help but feel like he is a little too friendly with the opposite sex when he is in a relationship. He says I am too jealous and he loves me and he lets everyone know it but it still makes me feel insecure... some advice would be fantastic...? I would like to know if I am overly jealous or if I have a reason to be bothered.