Guys With Female Friends

I really need advice. I've never been with an guy like I am now that has so many female friends! I can't tell if I'm being unreasonable or if he's the one who is doing unreasonable things. Got example, he is very helpful and genuine to the point that he's almost naive. He helped out this girl for an hour and a half over the phone about her boy problems. He told me about the convo the next day. My boyfriend is in the army and 600 miles away so trust is incredibly important to have. I'm glad he told me, but it made me feel uncomfortable that he's been talking to some other girl late at night on the phone for so long. I can't help but wonder if he shares information about his and mine relationship as well (he says he doesn't). Anyways.. I told him it made me uncomfortable. Well, he came back home for Valentine's Day. His phone went off and one of his ex was texting him hi. I decided to look for further messages (I know this is wrong), didn't find anything, but then found that he's been face timing her THREE different times this week, one of them being for an hour long! And it just so happened to take place after an argument we both had. So I went ahead and asked him, and said "have you been talking to your ex for any reason at all" and he flat out lied to me and said no. Once he admitted the truth , Again, he told me he was helping her with her problems. And even went and text her about it so that she'd say there's nothing going on and that she'll stop talking to him! Am I the only one who thinks thinks this is weird?? He makes me feel like I don't trust him at all with any girls but it's so different when it's an ex, over face time, for hours at a time! He also tells my room mate all of our business and his mother. So I keep thinking he might be telling other girls, too, which is a huge no no for me. I just don't understand any of this. Is this normal? Please be honest.
FYI I have already talked about this with him. He apologized and said he was sorry that he lied, he was just trying to protect my feelings. And that he doesn't want to just tell people to F off when they ask for his help. I can't help but be angry at these type of girls. Why are they talking to someone else's boyfriend about their boy problems instead of their actual boyfriend like an adult? Or their several of closer friends than my boyfriend? Both of them haven't even talked to him in almost a year and choose him out of everyone to vent to? What the heck? :(