Symmetric Conditionals

If I'm your cousin, you're my cousin.
If I'm next to you, you're next to me.
If I'm across the road from you, you're across the road from me.
If I'm married to you, you're married to me.
If I'm the same height as you, you're the same height as me.
If I can add your money to mine, you can add my money to yours.
If I'm identical to you, you're identical to me.
If I share a secret with you, you share a secret with me.
If I dance with you, you dance with me.
If I'm upside-down to you, you're upside-down to me.
If I'm the opposite of you, you're the opposite of me.
If I've never met you, you've never met me.