Ooff. I agree it looks like cheating has probably happened from that wording or it would be some polite fluff about still being best friends. Poor MM if true.
I expect this will pan out well long term. I get the impression she's rather more cerebral than he is.
I know she's gone down the influencer route rather than the medicine or political correspondant route so far but I think she appears to pick and play her hands shrewdly and is generally quite eloquent. I noticed it on love island and think that gap would start to widen for both over time.