Answer seems so illogical to me

I am so lost at the moment. I hope that someone will notice this and answer to my problem. Maybe it will look like a teenage problem for you guys but it still bothers me too much, can't even continue with my studies.

So there is a girl ( I will call her Layla ) and i thought that she likes me because of her behavior towards me. There are many actions/situations which brought me to that conclusion, i will point out few:

1.She asked me if i have a girlfriend ( twice ) and why not and then told me that i should have asked her if she has a
boyfriend.

2.She asked me to sleep over at her apartment ( i did refuse because i thought that she was in a relationship).

3.While quarantine we were on Teamspesk with few friends and one of them asks me if i can help a girl ( from the same
university) with studies but Layla responded :" No, Leave him ( me ), ask someone else to help her".We all knew that it
wasn't about helping her with studies but more like "having fun".

All this time I was thinking "Why is she behaving like that, she has a boyfriend? Maybe she likes me and not just as friend but nah it can't be" so I tried to keep my distance and not to do anything stupid.
After a while it comes to my attention that she broke up with her boyfriend(1-2 years ago). Then i start seeing this whole situation from another perspective, that she likes me ( or so i thought).

So one day i decided to tell her that i like her but her response was totally different than i had expected to be.

Here is how the conversation went ( Not going to post everything , just that part where i tell her about my feelings):

Me: Anyway, this quarantine is so boring and since we cant do much about, i guess that we are just thinking about things, so what are you thinking about?

Her. mmm about all the missed parties hahaha

Me. Well I am thinking about you and why haven't I told you before that i like you.

Her: Stop joking (smiley face)

Me: Actually now I am not, i just can't hold it anymore.

Her: (facepalm)

Me: Why? have i done something wrong?

Her: No, you have just expressed your feelings but at the moment I am not looking for anything

Me: I get it, seems like i have misunderstood you

Her How?

Me: I have thought that you like me

Her: Unfortunately no, sorry. I was in a long relationship before.

Me: Yeah, i know, friends told me. That's why i didn't want to bother you while we were hanging out. But your behavior and your happiness towards me, drove me into thinking that you like me.

Her: I am sorry if you felt that way.

Me: Ah, isn't your fault. Did i have any chances at all with you?

Her: No because i wasn't even thinking about it

Me Yes , i understand it. Can i ask you one thing more?

Her: Sure

Me: I don't want it too look rude or impolite, really i don't but before the quarantine you did ask me twice if i had a gf, you even asked me if i wanted to sleep over.

Her: Oh have i? i don't remember it. Maybe i just asked it and didn't mean anything else ( smiley face).

Me: Okay, but i do remember it well. It is written deep down in my memory.

Her: Sorry i don't remember it at all, it must have been some kind of a joke.

Me: Don't worry isn't your fault , i just hope that i will have a chance with you.

So my questions are:

Her answer seems so illogical to me. What am i missing? am i so naive?

I can recognize a joke, I am not that stupid or am i? I don't know anymore.

Do you really ask someone TWICE if you have a partner ( and why not) and if you want to sleep over , just out of a pure joke?

Did i move too fast with whole situation? Did she lose interest in me because i kept my distance in those mentioned situations?Was i too direct ?