What's the likelihood that my ex was cheating on me? She moved in with a new boyfriend in less than a month?

Anonymous
Just wondering what other people's thoughts on this are... Me and my partner of 6 years broke up in May. In late July she she got with another bloke and less than a month later (mid August) she moved in with him. They've also gotten pets together and posted photos of them all over FB (I'm still friends with her as I need to keep in touch in regards to money that she owes me that's rightfully mine!)

Personally I think that's insanely fast to get over a 6 year relationship and move in with someone! I can't help but wonder if she was seeing this guy behind my back whilst we were still together. What's everyone else's take on it?
What's the likelihood that my ex was cheating on me? She moved in with a new boyfriend in less than a month?
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