Does Venus square Neptune mean being deceived?

Not by other people, as a rule. What is described here is self-supplied: an outline filled in early and defended afterwards. Deception by somebody else is a fact about that person, and no configuration in a chart makes another person dishonest.

Is it bad for relationships?

It is difficult in one specific way. The gap between the picture and the person has to be crossed, more than once, and crossing it is work. Charts carrying this are rarely short of feeling. They are often short of information.

Does it get easier with age?

The habit does not leave. It does become recognisable, and recognising it early is most of the difference in practice. Nothing in the tradition says it improves on a schedule, and a description that promises one is guessing.

Aspect

Venus square Neptune

Venus square Neptune is loving the picture before the person has finished arriving. Venus is the part of a chart that decides what registers as beautiful and what is worth wanting. Neptune is an outer planet, and what is read from it is the softening of an outline. Under a square the two pull against each other, so the picture is finished early and the person has to argue with it.

The argument is the aspect. Nothing here says the picture was wrong — only that it was completed before there was enough to complete it with.

Why the correction never quite sticks

A square is friction between two things that will not merge. Here the friction runs between what is in front of a person and what they have already made of it. The making is fast, faster than acquaintance, and the correction is slow, because a picture is more coherent than a person and coherence is persuasive.

What follows is not a run of mistakes. It is one habit applied repeatedly, which is exactly why being disproved does not end it: the picture is corrected in the particular and rebuilt in general. This one turned out to be ordinary, and the next one may not be. Neptune moves slowly enough to describe a generation before it describes anybody, so what it lends is not a specific illusion. It is an appetite for the kind.

Sacrifice tends to travel with this, and it is worth separating from generosity. Generosity gives something and remains itself. The other thing gives something away in order to keep the picture intact, and the person doing it is usually the last to notice.

How it tends to show up

Certainty about someone very early, on almost no evidence, and right often enough to keep the habit alive.

Realising some months in that a person has been asked to be a resemblance.

Giving more than was requested, then finding it hard to name what was wanted back.

A high tolerance for vagueness in this one area of life and very little anywhere else.

What changes the reading

The margin a square is allowed is wide enough that a great many charts qualify. A contact near the edge of it behaves far more mildly than one that is nearly exact.

Neptune sits in a sign for years, so its sign belongs to an age group and says almost nothing about an individual. The house it occupies is where the softening is aimed.

What else touches Venus decides whether the picture is ever tested. A chart with nothing in it that insists on the difference between a thing and a hope leaves this contact unopposed, and unopposed is where it does its real work.

Questions

Does Venus square Neptune mean being deceived?: Not by other people, as a rule. What is described here is self-supplied: an outline filled in early and defended afterwards. Deception by somebody else is a fact about that person, and no configuration in a chart makes another person dishonest.
Is it bad for relationships?: It is difficult in one specific way. The gap between the picture and the person has to be crossed, more than once, and crossing it is work. Charts carrying this are rarely short of feeling. They are often short of information.
Does it get easier with age?: The habit does not leave. It does become recognisable, and recognising it early is most of the difference in practice. Nothing in the tradition says it improves on a schedule, and a description that promises one is guessing.