If this square sits in your natal chart, love and reality have lived in separate rooms since you were a child. Venus governs whom and how you love, what you find beautiful, which kind of beauty catches you, what you'll risk for the sake of an attraction. Neptune blurs the outlines: it adds fineness, dreaminess, the ability to see deeper than is there — and, in the same breath, the ability not to see what isn't. Ninety degrees of direct tension run between them, which means one part of you is always reaching for a concrete person while another, at the very same time, is finishing them off into the image you actually need.
This tends to show up fairly early. Teenage infatuations for people with this aspect often follow one script: a vivid first meeting, a few weeks of near-perfect closeness, and then a slow dawning that the person turned out not to be who they seemed. Sometimes the person really is to blame — they hid something, lied, played a part. More often it isn't them at all but the architecture of it: you fell for not them, but for what they might have been. A year later it repeats with someone else. Three years later, with a third. And at some point you start to notice that every story has the same point in it where you stop looking and begin to believe.
Money carries the same theme, only quieter. Venus in the chart is also about material values, about how you earn and spend. Neptune adds inattention to that, especially where people you like are concerned. You lent a friend a large sum for her dream and it never came back. You believed a partner that you were both putting money into a shared venture, and it turned out only you were. You helped someone close climb out of a hole, and instead of climbing out they started dragging you down into it. Each of those stories teaches honestly, and over time you build an inner rule: financial matters in one place, feelings in another.
Creative work, for this aspect, is almost a saving grace. Venus square Neptune gives a fine aesthetic sensitivity that's nearly impossible to discharge through loving people alone. Too much of it gathers inside, and if it isn't given an outlet it goes looking for one in fresh romantic stories, all with the same ending. That's why so many people with this aspect arrive, sooner or later, at some craft: they write, photograph, sing, paint, make clothes, dress a room. What won't fit into a relationship turns into material, and the material comes out alive.
I see one shared arc in clients with Venus square Neptune. Up to around thirty it's a run of disappointments in which it seems, each time, that the partner is to blame. Somewhere in the thirties or forties something shifts: you notice that the partners were different but the script was one. That's the first real collision with yourself, and it's not pleasant. After it, though, a different life begins — you don't lose the sensitivity, but you stop being its hostage. You still fall in love, but now you know the place to stop and look. That is the mature way of living the square. From there grow relationships built not on an image but on a real person, and out of that footing rises the thing this aspect was apparently given for: a capacity to love alongside the truth. How exactly it plays out for you depends on the signs Venus and Neptune fall in, the houses they occupy and what else aspects them — all of which want reading together rather than in isolation.
The shadow side, and what to do with it
The shadow side of this square is plain and unflattering: you fall in love with your image of a person rather than the person. Every disappointment lands as a betrayal, even though the partner usually promised nothing at all. Integration comes through one skill that takes years to build — separating what I feel towards someone from who that someone actually is. It helps to keep a clear-eyed friend, a therapist, sometimes an astrologer nearby, and to test your readings against theirs. Creative work helps almost without fail: what can't find its outlet in an ideal love turns beautifully into music, writing, design, photography.