The Three of Cups indicates friends, fun, and parties. Typically, when I pull it in a read, it's because the querent is in dire need of going out and having some fun. Have you been working too hard? Are you shutting yourself away after having some heartbreak?
If so, then it's time to go out. Go out with people you trust, or at the very least go out, period. Right now you probably need to have a bit of a shift in energy to help you remember the world around you, and to help you recharge to go back to what you are doing, or to help you heal.
Know, too, if you are the workaholic type, that sometimes the solutions you need for work come to you when you allow your brain to focus on something else. Brains are funny that way and that is why writers usually come up with good ideas when they are taking a shower. You are allowed to have fun. No seriously, you are.
Make sure too, that if you are someone who leaves fun until last minute, and it comes time to pick something to do, but you are overwhelmed by choices, sit down with yourself in the beginning of the month, and go through possible things you can do, or things you've always wanted to do or try. That restaurant, that sport, that rock concert, whatever makes sense to you. This way, when push comes to shove, you look at your list and there you have it. Fun!
Now as far as the wisdom of friendships go, friendships are meant to nourish you. To allow you to feel at ease. Sometimes it's easy to forget that, and we populate our lives with people that don't resonate with us, because we are afraid of being alone, or afraid we won't fit in elsewhere. Know it's far better to wander around alone until you find your true tribe, than to be with one that diminishes you in any way.
One of my favorite quotes about relationships is by the lovely Dr. Clarissa Pinkola Estes. She writes:
“Having a lover/friend who regards you as a living growing criatura (creature), being, just as much as the tree from the ground, or a ficus in the house, or a rose garden out in the side yard... having a lover and friends who look at you as a true living breathing entity, one that is human, but made of very fine and moist and magical things as well... a lover and friends who support the criatura in you... these are the people you are looking for. They will be the friends of your soul for life. Mindful choosing of friends and lovers, not to mention teachers, is critical to remaining conscious, remaining intuitive, remaining in charge of the fiery light that sees and knows."