To tell if your girlfriend is falling out of love, compare her with her own earlier self, not with the first months' rush. Fewer messages decide nothing on their own. Notice whether she still makes plans that include you and comes back after a tense moment, then ask her once, calmly, what she is carrying.
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Settling, outside pressure and pulling away can all involve less contact. We read 233 people on two public forums, a Thai one (Pantip) and an English one (Ask MetaFilter), who wrote about a partner going cooler after the early months, or about cooling themselves. Of the 35 who described a partner who had cooled, 11 described less contact and nothing else, and 9 said they had no idea why. Of 113 answerers who said whether the change was ordinary, 68 called it settling or tiredness and 45 something more. These are people who chose to post, not a sample of couples: the counts show what they described, not how often anything happens.
How can you tell if your girlfriend is falling out of love?
No single sign tells you, but you see more by comparing her with herself, on things that matter more than message count. Ask four questions about the last few months against the months before: does she still make plans that include you, weeks ahead as well as this weekend? Does she still tell you about her day without being asked? After a disagreement, does one of you reach back, and does she take the hand when you do? Does she still say “we” about things that are months away, a trip, a visit, a move?

If those hold and only the texting has dropped, settling into ordinary life, or a heavy stretch at work or at home, is one explanation to consider. It does not rule out a problem between you. If the plans, the stories and the coming back have all faded together, that is a reason to talk. Neither picture tells you why; that is what the conversation is for.
One caution on those four questions: they are our reading, not a finding. Talk of a shared future and making up after a fight were not among the things we coded for each person. A separate word search of the 35 askers’ own posts found words about the future or plans in 5 and about apologising or making up in 9. That shows how seldom askers wrote about them, not whether those things happened.
Fewer messages on their own don’t tell you whether she is settling, carrying pressure or pulling away.