I caught my partner having video chat sex with another woman from across the country. He also said, “ I love you to her” is that cheating?

I caught my partner on camera having video chat sex with another woman. He said, “I love you baby” and other comments that would suspect a relationship. I then found out that they’ve talked even before I was ever in the picture and it’s been a phone relationship on and off. I was lost for words.
Is this considered cheating? And if so, what are some red flags that it’s still gonna happen later on?
I caught my partner having video chat sex with another woman from across the country. He also said, “ I love you to her” is that cheating?
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