Am I crazy

Soooo I found a pink jacket in my boyfriends car. He said it was his uncles girlfriends daughters. His uncle drives and it’s not very likely my boyfriend will drive them about due to this reason and due to him being a lot older than my boyfriend. Anyway I tried the jacket on to see the size as his uncles girlfriends daughter is only young. It basically fits me just a bit small to zip up, I’m 21 years old. This jacket is not children’s sized.

I searched her up on Facebook to see her daughter is only around 7/8 years old and her son is 12 years old. My boyfriend told me her daughters 14 years old and that’s why it kind of fits me and that he was driving his uncle n their kids around which is highly unlikely.

I said ok so I’ll message her to let her know incase she needs her daughters jacket back. He literally tells me if I message her he’ll never speak to me again because it will “cause drama”

So I messaged her anyway due to the story not making sense n due to her daughter being so young and nowhere near 14 so somewhere he is lying.

Was this okay to say? I didn’t tell her why i messaged I just messaged her about the jacket or am I crazy for this

Update:

Ok so she replied, it isn’t her daughters jacket. she said she’d ask my boyfriends uncle if it’s his daughters (they both have their own kids). However my boyfriend had told me it was only his uncle, uncles girlfriend and HER 2 children in the car, not his uncles children. Something in his story is just not adding up because he would’ve said oh “its my cousins jacket” not “it’s my family members jacket. My uncles girlfriends daughter”

And even so his cousin is about the same age as his uncles girlfriends daughter, maybe a year older

ANOTHER UPDATE: I haven’t ended it as of yet I need solid concrete proof, his Snapchat notifications come through on his phone but they said “notification hidden” so he’s clearly hiding something, I’m going to address it when I next see him!