did I HURT his feeling

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hi mylotters~ I need you help ! CJ(a boy) and I grew up together, we've been friends since middle school, we always share interests and feelings and secrets. We went to different universities in different cities a couple years ago,I don't call or text him frequently at school but we hang out every vacation when we return home and make fun of each other even pretend to be couple, I know there's something in both heart of ours though it can't be a starter of relationship, but I know it exits. we were having fun the other day, he grabbed my cellphone suddenly while at this moment a msg came into which sent by a guy(he said he wanted to be my bf), then he sneered and give it back to me. it's awful…… today,I saw his MSN signature turns "I like girls, but now I like boys as well,I'm a BI", but he's totally straight before…………and when we have eye contact now I feel something in his eyes,,,,it's upset could you tell me if I hurt him???? If he's a BI from beginning, it's fine, I'm okay with that. But what he did makes me feel I did something bad to him,which seems cruel