What's my teacher trying to say?

A few weeks ago a teacher left my school and, as I was very close to him, I got him a thank you card (he's helped my an awful lot over the past year - almost acting as a psychologist for me). When I gave him the card he said that he'd open it when I wasn't there if I wanted (I told him he could open it then). I didn't think much of it but then my friend came in and gave him a card and he just opened it straight away without saying anything. I didn't think much of it at the time but then I was talking to my friend a few days ago and she said that sounded a bit weird. Now I'm really worried about what he'd thought I'd written in the card or something... And thinking back he's said other things to me like 'you hide a lot' and 'is there anything you want to tell me'. I'm just very confused and don't want him to think bad of me. It's been really bugging me the last day or two and I feel stupid for not noticing beforehand when he was still at school and I could talk to him about it.

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