the best friend .....

so i’ve been dating my boyfriend for almost a year now. he’s in the marines and is stationed 40 hours away from me right now, so facetime is the best thing i have right now. anyways, he has this best friend (lets just call her A) and they’ve been friends for awhile, except they hooked up this past fourth of july (long story - no he didn’t cheat on me lol we weren’t tg at the time blah blah) and they’ve had feels for each other - she still has feelings for him. i’m not the type to not let him have friends, but am i wrong for feeling uncomfortable? she facetimes him all the time, she called him the other day to tell him about her cinnamon toast crunch. they facetimed last night for an hour and a half too. i know he can have friends, i’m far from cray!!! lol, but i just feel like since he has a girlfriend, don’t you think she should know boundaries? and have respect for the relationship, or am i bugging out??! help😩