<human>: I've been dating this boy (call him B) for a little over a year, and we're madly passionately in Love and all that mushy stuff. Before our relationship B considered himself homosexual and had a couple (I believe the number is two, but he doesn't speak of the second one) of boyfriends... one of those boys broke his heart after about a month of dating (ex will be known as A). B was good friends with A before they tried having a serious relationship, and B has worked hard to repair their friendship, through talking and then eventually gaming together online. 

Anyways... B  mentioned earlier today that he and A are hanging out tonight. B didn't specify what that meant, I just assumed it = video gaming. B also didn't specify where. B hangs out with his other friends all the time, even spending nights at a time in a mutual friend's house. I rarely get jealous or insecure about those events, but A is a different story. I can specify on this if details are necessary. Just a combination of the last-minute plans and his worrying have me concerned. 

Am I overreacting? I just really need someone to reassure me that it's perfectly healthy and not suspicious to let your SO hang out with their Ex. I want to know what they're up to right now, but B isn't replying to my (normal conversation starters) texts. How can I get B to reassure me that there's no romantic (or intimate) feelings between him and A? At what point does it get annoying? Should I ask him over the phone, or in person, etc...?

Condense the text into a few key points
<bot>: feeling insecure/jealous about my boyfriend hanging out with his ex tonight/right now. This is my first boyfriend, so I'm inexperienced when it comes to the basics. What can I ask him?