Why my boyfriend's female friend is obsessed with becoming my friend?

His friend is a weirdo by the way...

we have been together for 3 years in September of this year, we just had a baby ; months ago (im still healing and still feel gross) but his friendship with his male best friend of 3 years ABRUPTLY ended... dont know why. I asked he has nothing to say. Thats a red flag in itself. Now he's got a new coworker chick he's inviting over on weekends to play MTG with (card game *he is addicted to* he kept her secret until my baby shower and ever since he has been talking to her nonstop

So with that being said im already paranoid from being cheated on and feel crappy about my postpartum body (she's overweight to say it nicely so its not her its just me its my first baby.) , and im also sketched out by the fact that his friend just up and disappeared... so no i dont trust my boyfriend very much. At first it was jealousy but now i could care less the problem i have is the way he brought her around and how i expressed my diconfort but he contiues to not care. I dont care who his friends are If one makes me uncomfortable im going to voice that. He can hang with her call her , do whatever he wants i dont care. But why is she so obsessed with me? He stopped spending time with me when she came around and texts her at night past 12am every night but in expected to not be bothered? AITAH?

its not like i dont like her because of her friendship with him, its just that i dont like her she's not someone i usually hang around with. Im very selective of my "friends". Also he completely ignored me the first 3 times she came to MY house so.. yeah thats not suspicious at all! He defended her saying she's shy or whatever bs he made up. she's far from shy now.
She doesn't know me.. but whenever he invites her over she buys me my favorite Starbucks drink, she tells her boyfriend that we are best friends.. WE aren't lol. Why is my boyfriend and this girl so pressed for us to be friends? Im not going to force a friendship with someone i dont want one with.

Why my boyfriend's female friend is obsessed with becoming my friend?
Post Opinion