My sisters boyfriend said he has feelings for me than kissed me?

Anonymous
I'm 16 almost 17 soon and my sisters boyfriend is 18. But here's what happened my sisters boyfriend came over to our house after football practice to wait for my sister until she came back from volleyball. But any ways I invited him inside and he said he needed to talk to me and so I said yea because I thought he needed my opinion on something or help because he always ask me for gift ideas or things my sister liked. So I walked over to the coach and sat down besides him and asked him wats up and he looked at me for a good 10 secs I asked him what was wrong and he grabbed my face and kissed me and I kissed him back and then stopped him and asked him what was that for he said he always had deep feelings for me and I'm the right person for him. I sat there shocked than got up and left and didn't go back until my sister came. I feel bad for what I did and I want to tell my sister but i am afraid to tell her because she really really likes him a lot and I don't want to make her mad or angry at me. So what should I do?
My sisters boyfriend said he has feelings for me than kissed me?
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