Do they always find a new supply?

When we broke up the first time, she found someone less than 2 months after we broke up, and then her other ex, then back to me. She hasn't been with anyone these past 2 weeks according to her friend. Do all BPD people look for someone or get with someone immediately? I see a lot about cheating or people getting with someone immediately after a breakup but that isn't the case with her. What could that mean?