If friend was once acting distant and cold towards you, and then after you ask them if everything was alright they start being friendly again?

What does that usually mean? So i have a friend who had recently seemed distant and colder, towards me compared to everyone else in the group. Now I do tend to overthink things and so Im not sure if this was really what was happening or if it was all in my head. Just didn't seem as enthused towards me like she did with everyone else and it wasn't always like that. At one point I messaged her and said " hey there i been wanting to ask you for a bit if i had done or said something that bothered you, just asking because seems like the energy has been a little different than before, but if not then sorry just wanted to check in. " Then came online immediately after that and read my message but replied like 40 minutes later saying " hey Adam no no not at all nothing you said offended me please dont worry!! Then i replied " ok cool " and since then she's been more engaging in conversations and reacting to and asking questions about videos i put in the group snapchat, and overall just more warmer like before. Oh and this is not someone whome im at all attracted to, but i just dont meet people i feel comfortable with and click with often so i cherish the people that i meet that i do click well with.

Since it was such i sudden turn around, should i still be concerned or look out for anything? Thanks

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+1 y
Or was the whole thing possibly just in my head? I do have quiet BPD
If friend was once acting distant and cold towards you, and then after you ask them if everything was alright they start being friendly again?
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