My boyfriend made me uncomfortable?

So I'm a Christian, I take my faith seriously and I plan on staying abstinent till marriage. I'm also in a relationship and my boyfriend is really sweet and patient with me, however we've only dated for almost 2 months and just recently when we were kissing, he, kinda, grabbed my butt. I was really not ok with that I don't mind being touched but I didn't feel comfortable with it and I don't know if/how to tell him that I would rather he not grab my butt when we kiss. Any ideas?
My boyfriend made me uncomfortable?
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