Do guys really have a "freak out" phase when they become distant if they feel a relationship might start?

So after doing a lot to win a girl over, I have heard that guys might go through a "freak out phase" or a phase when they act more distant than they have done before because they are partially afraid of loosing their freedom? Or some other sort of fear? Has anyone witnessed this type of behavior or have guys experienced it themselves?

How can you know if they are going through a freak out phase or if they are just not that interested anymore?

Can a guy be really interested one week and then kind of just lose interest a week later? Or does that usually NOT happen?

I know that as a girl, if I start liking a guy, it's often impossible to stop liking them immediately like that. But I am not so sure about guys...
Do guys really have a "freak out" phase when they become distant if they feel a relationship might start?
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