Is this classed as cheating?

so my ex boyfriend broke up with me a few months ago. Whilst we were still together, from around October last year, I noticed that he would text this girl from our college. At first it was nothing bad, just sending jokes and funny pictures, but then I realised that sometimes he'd talk to her more than he spoke to me. I also found that sometimes he would delete the chats he had with her. When I asked him about it, he would always say that I was being paranoid and controlling, and that she's "only a friend".

So when he broke up with me, I found out that straight away he started to try and get with her. As this is the exact same girl thate told me not to worry about, but is now trying to pursue a relationship with a few months after breaking up with me, would you class this as cheating?
Is this classed as cheating?
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