So we've been close friends for a couple years now, majority of the time we get on really well and she's lovely however we have these moments where I'll mention a problem I have and she more or less tells me it's nothing compared to what she's going through/has been through. I'm always very supportive towards her, I'm there when she has a problem however this isn't always returned. A conversation we had the other day has really been bothering me, I was talking about my grandfather being really ill and to be honest I expected some comfort from her and instead she told me I was lucky because he was alive and she never met her grandparents so I should be grateful for the time I have with him. I told her that I was and I was worried about him. I was leaving then anyway so the conversation ended. I wasn't sure if she'd even noticed that she had upset me and it turns out she hadn't as she casually text me earlier like nothing had happened. I don't understand her behaviour sometimes