Search Results: disrespected by guys

So in y boyfriends past he hung out with two girls. Their names were Hanna and Jocelyn. And in assuming they were best friends. Well before my boyfriend met me, he hung out with these girls and had strong feelings for both of them. They both had to stop talking to him, So then he met me and after two months of talking, were finally in a relationship ! So months go by, and were cuddling I the couch and he looks at his phone, gasps, and hides it. So me, being playful grabs his phone he is literally fighting me about me ((nothing physical, nor mean )) and I check the message and it's Jocelyn. So open it and see that he messaged her first and said that he missed her, which was an instant mood killer for me because I can't help but feel that he tried to hide it from me. And I talked to him about it, and he said that he feels that he should be friends with whom ever he wants and same for me. But at the same time gets upset when I hang out with my guy friends that I have known since D-day. Basically what I'm getting at is, is it disrespectful and/or wrong to be friends with your ex or people you used to like or people who used to like you? If so, can I have reasons?