<human>: Can you condense the text into a few key points?

We were dating for 6 months, broke up, then got back together after 2 months. Never mind the reason why because it's a complicated story (isn't it always?). It wasn't infidelity or anything - in short, we both agreed we best stayed friends (we knew each other as friends for years before we started dating), but then I really started missing her and apparently she missed me. I might expand on the break-up in the comments, but for now I want to keep the focus on this:

Whenever I send her a text, it usually takes hours before she responds, sometimes days, sometimes she never replies. She's always been like this with texting - all her friends complain about it, but lately it's been worse than usual (than in our first relationship).

I'm always the one initiating the text conversations, the phone calls, and the dates. It's starting to feel very one-sided. She makes me feel "needy" even though we don't text all that often (on average maybe 3 texts/day). I "constantly" think about her and why she's doing this. I don't think she's cheating on me (if she is, then it's not sexually - she has issues with sexuality due to vaginismus). My biggest fear is that she's doing this on purpose, to stay in control of the relationship. It's working and I hate it to the point that I want to give up.

When I ask her about it, she always has an explanation. She's always busy with something. I understand this: she has a lot going on right now (nothing dramatic, but still enough to cause stress). Most likely, this explains why she's very frugal with her time. Still, I'm a busy person as well, but I make time for her. I feel like if she was really "in love" with me, she would do the same. But probably I'm overanalysing things and I feel like I'm needy because I am and I should probably be a bit more patient.

Any advice on how to deal with this would be very much appreciated.
<bot>: Girlfriend rarely opens up communication. Should I stand my ground and demand a bigger investment from her in the relationship or break it off? Or should I be more patient and play her game: stop communicating until she makes the next move?