Why did my guy friend kiss me on the lips?

My guy friend and I are very close, and we flirt a good bit. He's been seeing a woman for a while, but in the last few months he told me it's just from time to time. He says he is trying to figure out what is going on with their relationship. He is in his early 40's.

A few weeks ago, I saw him a couple of times and in each instance we hugged goodbye. We wrapped our arms all the way around each other, with our bodies in full contact. And each time he kissed me on the lips, about 3 or so right in a row. They lasted a few seconds each. Not exactly passionate, if you know what I mean, but not just a peck either.

Aside from spending one night together a few years ago, we rarely hug and we never kiss goodbye.

Shortly before any of this hugging and kissing happened, I told him I am interested in having a sexual relationship again, if he ends up breaking up with his girlfriend. Much to my disappointment, he said no. He said he doesn't want to risk losing our friendship by doing that. And he reminded me that he is mixed up about his girlfriend right now. So why did he hug and kiss me?

We are supposed to be going hiking next week, and I don't want things to be awkward. What should I say to him, if anything? Is he playing me or could he be working up to having an honest (no other girlfriend) relationship with me? Lastly, I will admit that I even suggested a friends with benefits situation, but he still said no. Does he respect me and our friendship that much to say no to FWB? If that's the case, again, what's with the hugs and kisses?

Please, don't judge me about the FWB. This is already difficult enough for me. I don't think I could do it anyway. It's just a reflection of how strong my attraction to him is. More than anything, though, I cherish our friendship. But if he called me tonight to have some fun, I'd get out my party panties and be there in a second. Please help, I'm so conflicted. If I were completely without ethics, I wouldn't be asking for advice. Thanks so much.
Why did my guy friend kiss me on the lips?
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