This is really tricky, OP.
I've not made many male friends and would then visit their houses frequently enough to think that this is purely 100% platonic on HER part. Perhaps for your BF, it is, but we don't know her and her intentions.
Also, I'd wonder if this new friend has asked your boyfriend to meet the girlfriend yet? Has she made any effort to reach out to you through text or has your boyfriend made any effort to coordinate you two to meet? If she's so lonely and lacking in friends, you'd think that she'd be totally up for meeting you - and IF it were me I'd want to make sure to make it clear that I, the friend, am not trying to steal your man.
I dunno, sis. Smells kinda fishy to me.
Here's the other hand - if everything is bullshit and he IS cheating on you, then this obviously isn't the person you thought you knew. He's garbage and he thinks he's slick playing the game. Cheaters cheat for purely selfish reasons.
If I were you, I'd sit down with your boyfriend and vocalize my concerns and try not to sound insecure and jealous while doing so. I'd keep calm and neutral as possible while I'd ask him straight out if there's something going on between them and if there's anything he needs or should tell you. If he's being honest and is sincerely just wanting to be friends with this girl, then ask to invite her over for dinner to officially meet and hang out and get to know one another. If this whole situation is as innocent as they'd want you to believe, this shouldn't be a problem and it should happen sooner rather than later.
Don't be catty. Resist if you can. You don't have to pee in all 4 corners when she shows up - she SHOULD know who you are. In fact - she SHOULD be sincerely interested in making friends with you. Who knows, maybe YOU'LL end up cheating with her on HIM! Wouldn't that be plot twist?
Either way, I'd walk slowly and try to keep calm. Boyfriend has some 'splaining to do, but give him a fair chance to 'splain. Good luck, OP!
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