Regarding the to getting forms, i. From that point things started getting complicated. In your exact context, the real underlying implication is probably more don't go too fast for your dating partner rather than.for.
Stacey Solomon shares sweary post and says she's putting toxic people
In grammar in use book, the bold part has been considered as correct answer. From that point things started to. However book titles are allowed artistic license.
He did not succeed in getting the job though he tried his level best.
So, i like getting/ to get to the station in plenty of time. From that point things started to get complicated. To get is the normal form and would be best for everyday use.