I told my guy friend that I had no feelings and I ended up kissing him so why do I feel guilty?

So last weekend my guy friend joked that I was his girlfriend after my dad asked if he had a girlfriend. Yeah we were joking but that made me uncomfortable. That was when he and his mom came to visit. I know I’ve been single for a while and I haven’t dated since I was 21. I’m 25 now.
My guy friend has been texting me a lot and send me have a good day beautiful which is very sweet.
So he and I met up and discussed about what happened. He said he knows we’ve never really dated and went to the school dance together as friends but he said he only asked me because I’m way more beautiful than the other girls at the school and wasn’t interested giving other girls a chance because he only liked me. He understood I wanted to go with other guys but he always asks me to go to prom because he likes me a lot but was too afraid to ask me to be his girlfriend.

He admitted he was jealous when I went to the prom with my crush but my crush kept leaving me to hang with his friend and abandoned me. My guy friend said he would NEVER abandon me and that guy wasn’t right. He admitted that he’s seen guys that come in and out of my life with someone dumb treat me horrible or always likes my petite friends. Never understood some guys like me. I was never a fit person, tall, chubby and plus size. Most of my girl pans are slim, petite or average size. Average height.

My guy friend is 6’2, overweight but he’s losing weight and not in the best shape but he’s a sweet guy but I see him as a friend.

He admitted that he wasn’t joking about saying I’m his girlfriend because he’s in love with me. BIG TIME.

I was mind blown. My friends and peers were right! He does like me. I was about to tell him I only liked him as a friend but he kissed me.
Then seconds later I ended up kissing him back. I didn’t pull back. We ended up making out at the park. Why did I do that?

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I’m 5’11
I told my guy friend that I had no feelings and I ended up kissing him so why do I feel guilty?
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