“what do i do if i miss a girl but she cant love clearly, shes immature, and probably isnt best for me”

Another soul answered...

The problem is that you think a person has to be perfect or good for you to miss them. A lot of people have been terrible to me, and yet I still miss them. The problem isn’t missing them—it’s believing they’ll be good for you. That’s exactly why it’s better to forget the people who didn’t really leave you with anything good. Don’t beat yourself up over what’s already gone. If you know it’s not the best thing for you, you’ve already done the hard part: admitting that they shouldn’t come back into your life. If you miss them, just remember: time will pass, you’ll meet someone else, who’ll be good to you. You’ll probably meet hundreds of people throughout your life—many will leave, and many you’ll forget—so look ahead and move toward the future.