The kind of man who feels compelled to ask these kinds of questions is exactly the type of man who shouldn't be asking . He's not ready.
That being said, 45 is high as fukk, and that's assuming that's the real number and not a crude estimate. It doesn't matter how you break it down; even if she started fukking at 12 and "only" fukked 3-4 nikkas a year, the number still points to high levels of instability or irresponsibility.
Even for some of the "slutty" chicks you don't start seeing those kinds of numbers till the late 30s and 40s for the simple fact that unlike men, most women are not insatiable and willing to fukk on just about anything (unless for money). Most chicks haven't even met 45 guys they WANT to fukk by age 27 (unless she's an IG thot or an industry chick surrounded by attractive/high value men on a regular basis), let alone actually fukk them and tell the tale.
It obviously bothers you (and understandably so) so just next her and call it a day. And no, unlike some of these nikkas I'm not bout to advise you to just keep fukking her for a while and break up after a while. That's exactly the type of (non)logic that gets some of you nikkas caught up down the line.