Most Helpful Girl
You need to stop thinking about what she may or not be doing or thinking and just focus on you. Thinking about her and her activities and thoughts is not healthy and won't do anybody any good. If you came close to having sex but didn't, just try to grow the relationship with that girl and any other activities you can to keep you busy.
Most Helpful Guy
Probably on the rebound. I've been there with a girl that just needed someone to lean on for a while. Lasted but a few weeks. I doubt it will last long.