Girls, Why would a girl suddenly stop responding after a positive conversation with a guy?

I’ve been talking to a girl I’ve had a history with, and after some time apart, we recently reconnected and had a positive conversation. During this conversation, I complimented her in a playful way, calling her an ‘unsung hero’ of her job. Genuine compliments were something I would say to her when we were in each other's lives. However, after that text, she suddenly stopped responding and hasn't reached out again. Its been a few days.

We’ve had a positive history, but we've also had some ups and downs. The conversation we had seemed like it was going well, so I’m confused as to why she would pull back like this. I didn’t say anything that I think could have made her upset or uncomfortable.

I’m trying to understand what could be going on in her mind. Could she be processing something internally? Does this mean she’s lost interest, or is it possible she’s just taking time to think things through? How long does it usually take for someone to make a decision about whether or not they want to continue talking or re-engage with someone?

Also, what is the best approach to take when a girl pulls back like this after a good conversation? Should I give her space and wait for her to reach out, or should I consider moving on?

P. S: This girl and I have a long and complex history that includes both high ups and low downs. I've unfortunately let her down in the past and there was hurt between the both of us for a long time after I left her life. However behind the resentment/bitterness that lasted for over a year was hurt. I want to rebuild trust with her at whatever pace she feels good with but ultimately I don't want to make her uncomfortable if she's potentially not interested anymore.

Girls, Why would a girl suddenly stop responding after a positive conversation with a guy?
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