Hi, SD.
I think this such a good and matured question for one of such tender years, so you can be proud of yourself for having the clarity of mind [also a gift of Neptune in its highest form] for having observed and thought about this important life pattern.
Friendship, a special kind of relationship, is associated with the 11th house. Your 11th house is in the sign of Taurus, which is ruled by your natal Venus in Pisces.
So we look to Venus' condition to understand more about friendship in your life. As mentioned earlier, it is exalted in the sign of Pisces, so there is a grace and openness that you inherently bring to friendship. Venus is in close, easy aspect to expansive Jupiter, so Venus' qualities are enlarged or amplified. Looking more closely, we see that Jupiter is not only in aspect to Venus, but also is its ancient ruler. [Neptune is its modern ruler, so your Sun-Neptune is connected to this as well].
But let's return to Venus and Jupiter. Looking more closely at Jupiter, because if its double influence on Venus, we see it is in the sign of Capricorn. Capricorn is connected with many concepts like stability, but some other concepts that are relevant here may be restriction or scarcity or limitation. So there is an element of loss or restriction in friendship that Jupiter in Capricorn may bring.
Now, you talk about two ways that friendship might end. The first might be about what causes a friend to lash out at you, to "hurt [you] really badly." This may be connected with natal Pluto's challenging aspect to Venus. Sometimes when our Venuses are connected with Pluto, there is sense of manipulation or force that the other person may perceive coming from you. Or it can just seem like you are intimidating in some way. It really hard to know how your particular friends may have perceived it without seeing their charts, but this is one possibility. Another, more subtle expression of this energy is that you might attract people who want to manipulate or overpower you. In these special instances, there can be blow-ups where ugly, hurtful things are said. And it may be best that those friendships cease.
However, the gaining and loss of friendship, like dating a number of people before you find the right one, is a normal part of our early years as we explore and grow to understand other people. It is a culling process that brings us to genuine friends and others of value in our lives. So a part of these episodes are to be expected. It may not make the loss any easier, but it is an important life lesson about loss.
The last thing I want to suggest is that an important, perhaps the most important, place to look when there is a falling out is to yourself. When two people are in a disagreement, it is almost always true that both of them are responsible in some part for the falling out. There is no innocent party and guilty party. Both are parties to the misunderstanding or argument. So it is important to look closely to yourself, to try to understand your part in the problem. And that can take time to learn to do. But it is one of the most valuable life tools that I have acquired [and at a much later age than you!
]. And that is to look to myself for the problems before me, in a healthy, compassionate, forgiving way, with the aspiration to bring greater self-awareness to all my interactions. I am wishing this for you as well.
PS You are correct that your
secondary progressed Moon changes every two and a half years.