Why is he weird

So my amazing SO is just a weirdo

His ex gf is his sister's BFF

And his sister is always talking about her to him!

It's annoying

But I'm trying to approach this matter maturely

And I haven spoke to him about it

I just don't know how to think sometimes.

Also his Instagram... he deletes Instagram then goes back on

He doesn't talk to anyone on Instagram but why does he do it

It's beyond me. I trust him but I don't understand this odd behavior

He treats me like a queen

He wants to marry me but sometimes idk why he behaves in ways that make me question.

But other things he does make me realize how much he loves me.