Am I a bad person? (23m dating a 23f)

I was dating this girl for basically 2 months, we hanged out together 5 times, of which 3 we slept together and in one we had physical contact in bed and nearly sex.
With the time going on I found out that she wasn’t the right person for me (some factors which for me are important lead to incompatibilities) and really I started to feel bad and trapped when surrounded with her. There were certain moments which were good but at the end of the day I think I really didn’t have much feelings for her.
For this reason 1 week ago I told her we should be just friends, she was okay with that and suggested me to be a bit more, like fwb. I said it was ok (we never had sex actually so for me that was like friends but with kissing each other, idk…) and then I started to feel that she started to get more and more attached to me, like really having a lot of feelings on me. At the same time I started to feel even worse in all of that and wanted to escape so much.
Today I made my decision, we made a videocall and I told her that seriously, I don’t have many feelings and we should be just friends (i.e. not have anything physical or romantic at all), that I needed time to understand what I was feeling and so on…
She cried a lot and said that she was starting to feel a lot of me and I am a bad person because this night she will be unable to sleep because of me while I will wake up tomorrow and feel “normal” (I don’t know if this will be the case).
Do you think that I did something wrong?
Like really I wanted to see if it worked out but at the end I really felt that it wasn’t working and at the same time she put a lot of pressure on me… my stomach hurts now because really all of this was too much, from my side I would say that we weren’t even in a relationship in the first place so idk, wasn’t expecting such a reaction.
I usually care a lot about those with whom I start to have a connection but in this case it was really difficult to feel any…
Now after 2 videocalls she is still messaging me, saying things like “I cared so much about you”, “I can’t believe this is happening”, “I can’t believe you won’t care tomorrow morning”… should I reply? I really don’t feel like that, I would just like to go to sleep and try to forget all of this.