I'm thinking of disproving of my fiancee's outings
Does it bother you when she goes out without you?
It does.
You should let your fiancee have the freedom to do the things that she enjoys. You can share how her behavior makes you feel, but ultimately it is her decision how she spends her time.
I'm going to try to control her like I used to.
I think that you should let her go out and enjoy herself. It is unfair to try to stop them from doing things that they enjoy.