No, there"s not. He"s not dating his ex, they hooked up a bunch in a short period of time, that"s it. That"s why she inquired about trying things again...because they aren"t together.
If you aren"t in a committed relationship why the fuck wouldn"t you date other people until you find someone who you want to be in a committed relationship with? I know I"m not the only one here who would date 2 or 3 girls at a time (in a week) because there"s nothing keeping you to one person. Again, that"s what dating and seeing other people is all about.