Replying to Emotions getting the better of me

I never actually thought I would make a thread on NS about my 'girl problems', but I need to vent and you guys are the best sponge I have right now (sadly enough).

So, I am 28 and I've had this serious girlfriend for the past 6 years, I broke up with her just over a month ago and immediately regretted it. A week after I broke up with her she agreed to meet me and I expressed to her my feeling and intentions. We both felt very optomistic about one day reconnecting but I had things I needed to work out and she needed "time and space" to think.

Well, I've figured my shit out, she's had her time and space and last weekend went to a three day rave with a bunch of rad people. After she got back from the rave she started texting me again finally, told me she misses me, but is confused. She will be getting into my neck of the woods in a few days before we both go into a music festival for the next 5 days. She informed me that she intends on being 'friends with benefits' with me before and during the festival. I can only assume she slept with someone else while at the rave, which could be the cause for her to take our situation a bit lighter.. Which I think I can deal with...

Now, I still love her and really really want to get back into a relationship with her, yet I don't want to be taken for a ride either. As much as I would love to have sex with her for the next week and move on, I don't know if it is for the greater good for my emotions. What should I do NS?

Should I be strong and tell her no. She can only have me if she takes all of me (body and mind)?

Should I just harden up and allow myself to be used and hope for the best?

If I am strong enough, I'm thinking about having sex with her once, but before we can repeat, get serious with her and tell her that it can't keep happening - would this help in the long run of us getting back together, or would it solidify the end of the saga?


Real life shit, I know - so no short version.