What should you do if a guy/girl pulls away?

What should you do if a guy/girl pulls away?
Assume the context is you guys were "talking", which means that you guys liked each other and weren't exclusive yet but weren't interested in other people. What I mean by each option:
  • Cut them off: completely stop initiating contact, reply when needed but don't initiate contact
  • Pull away also: give them space, act how they are acting, be a little more distant when they come back
  • Pretend you didn't realize: act completely normal
  • Ask what happened: present your findings and ask why they haven't been the same
Cut them off
Pull away also
Pretend you didn't realize
Ask what happened
Other
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What should you do if a guy/girl pulls away?
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