Is my ex wife's sister getting toooo close?

Iv been through a super shit time in my life.. iv lost someone who means the world to meπŸ˜ͺ am I right to think its awkward? Well i split up with my ex 6 years ago of who my kids are tooo... she got a sister who is always messaging me too make sure things are good and offering a shoulder tooo cry on.. the truth is.. she's always pissed but the most comforting person involved if you get me
Is my ex wife's sister getting toooo close?
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