What does this mean?

Absence makes the heart grow fonder – or colder.

It sounds sadly like the physical distance remains despite the close proximity.

I would move forward. If she makes contact again so be it.

hmmmm sounds fishy to me bro, I’d say she was up to no good when while you two were away. hard to say though, but I can’t think of why she would distance herself if she didnt feel guilty or bad about something, or if she missed you so much.
And my grandma use to say, absence makes the heart grow fonder…. of someone else.

Sounds like you might want to expect a break up, but offering to listen to her might patch things up. Listen with an intent to learn and accept whatever might come next. Be well fellow flutherite.

If you’ve clearly expressed to her your need to connect or communicate and she hasn’t or isn’t responding/reciprocating, leave her be until she comes to you. Don’t continue to pursue attention from her (as difficult as that may be). It won’t help your situation.

Here is a novel idea. Have your relationship face to face. It is very easy to misunderstand when your are only communicating sending text messages. Ask to get together with her. When you see her, ask if there is something wrong that she is not telling you. Tell her that you would rather know.

it means GTFO and/or she needs to communicate her intentions. That much time apart would make people who love each other miss each other no matter what the reason. It seems you do but not her.

It kind of sounds like maybe she had a little summer romance while she was gone. I agree with Marina. You should have a face to face talk with her and ask her what is going on. Good luck. I hope this works out for you.