Is she a rebound?

My ex boyfriend of almost 5 years got with another girl a week after we broke up, they are always with each other now, is she a rebound or serious? At first he denied that they are in a relationship and said that he’s doing everything he can to move on from me but then a day later I told him I found someone else as well and he said that’s his girl and he has moved on from me. He has blocked me on social media etc but people tell me that he puts up pics of her. I’m so confused!!!
Is she a rebound?
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