Should I be concerned by her behaviour?

My girlfriend and I recently moved into a flat together. Things are perfect.

We've also made friends with our neighbours, a couple too themselves.

First get-together, I didn't think much of it, but last night, I've noticed that she touches me a lot. Not just quick touches, but lingering ones on my upper back and arms...

She could be just tactile, but I find it a bit odd. I don't like being touched, unless it's my girlfriend.

Should I just let this slide?

Should I be concerned by her behaviour?
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