Cheating

Me and my boyfriend have been going out for almost 7 months now and I can't really say I love him because I don't really know the true meaning of love but we say it very often to eachother. Well the other day a boy from my school walked me home, I'm guessing he liked me and kissed me unexpectedly (I went in for a hug and got a kiss). I really do like my boyfriend he's very good to me, how would I tell him that, this occurred, without him hating me or breaking up with me? ?