I (22F) have been with my bf (23M) for 3 years and things were going great until recently. My bf has this female best friend from childhood (23F) who I've always been chill with. They're super close but I never thought much of it, until last month.

She got dumped by her fianc and has been a complete mess. My bf has basically become her emotional support human 24/7. He's constantly at her place, bringing her food, watching movies till 3am to "cheer her up." I tried to be understanding but it's been WEEKS.

Last weekend was our anniversary and he bailed last minute because she was "having a breakdown." I was crushed but didn't say anything. Then yesterday I saw texts pop up on his phone while he was showering. She sent: "Last night was exactly what I needed. No one understands me like you do." Followed by heart emojis.

I lost it. When he got out, I told him I was done being the "understanding girlfriend" while he emotionally cheated on me. He swore nothing physical happened but admitted they've been sharing a bed some nights because "she gets panic attacks."

I gave him an ultimatum - either set actual boundaries with her or we're done. He called me controlling and insecure, saying I was "kicking her when she's down." I said I wasn't asking him to abandon her, just to respect our relationship.

His mom called me later saying I was being a selfish b*tch who doesn't understand "friendship" and that her son was "just being a good person." My friends are split - half think I'm justified, half think I'm overreacting to a friendship.

i feel like I'm going crazy. Am I really the AH for asking my bf to stop playing husband to his heartbroken "friend"?