How to politely decline a kiss when you only want to be friends?

Anonymous
I was downtown last weekend trying to meet up with my friends and ended up not being able to get a hold of them, so I was walking down the street and was approached by a few people, both girls and guys. They were drunk and I wasn't, however I was feeling particularly social and didn't want to go home so I chatted for a bit. Then this guy asks is anyone was hungry, and I was starving so we decided to get some food. It was just the two of us and we had some good conversation about hobbies, our city, etc. Then he orders me a drink and I want to be polite, I don't want to 'assume' he's trying to take me home so I don't want to say something presumptive like blurring out 'I have a boyfriend'. Then after we finish up he comes and sits beside me and tries to kiss me. Really awkward and I didn't mean to lead him on, but I really only wanted to make friends and would have had the same conversation whether this person had been a guy or a girl. How can I make friends with people I meet randomly without leading them on? How can I politely decline when they lean in to kiss?
How to politely decline a kiss when you only want to be friends?
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