Sometimes I really struggle with decisions in relationships. I seem to get stuck in the reflection stage and feel like I want life or the other person to move me forward without actually making a decision. I realize this is not great, and it keeps me stuck in more than one way.
A helpful way, I find, to end reflection and make a decision is to move through a simple progression that goes from feeling to understanding to choice to action. Your reflections should not end with awareness alone; it should end with a commitment to behavior.
Reflection becomes meaningful when it produces a small, honest decision about how you will act next. Here is a practical process you can use:
First, feel the experience. Start by acknowledging what you are actually feeling, and what is triggering the feeling. Also, when did the feeling start? Is it something new or something older? This step matters because reflection that ignores emotion becomes intellectual avoidance, while reflection that is only emotional becomes spiraling. The goal is balance. 
Second, understand the reality, which is to move from feeling to clarity. What happened? What is your responsibility in this? What part belongs to someone else? This is where you weigh your perspective against reality, because our personal perception is not always the whole truth. The goal is not self-blame or self-defense. The goal is honest understanding.
Third, decide who you want to be in this situation. Reflection becomes powerful when it connects to identity. What kind of person do you want to be? What would be the best version of yourself in what happens next? What actions align with your values? This is where reflection moves from analysis into character formation. In this step you are not deciding how you feel. You are deciding who you will be.
Fourth, choose one concrete action so that your reflection ends with one small action for you to take. This could be apologize, telling the truth, setting a boundary, or letting it go. Behavioral change rarely happens through big dramatic decisions. It usually happens through small actions repeated consistently. 
Last, accept the consequence. Every decision has a cost. The value here is to do the right action for who you want to be, even if the outcome is uncomfortable. That acceptance is what transforms reflection into maturity.
A simplified way to assess this reflection-to-decision formula is to ask these questions in order:
What happened?
What is true?
Who do I want to be?
What will I do next?
One distinction to make is that reflection should not end with certainty. It should end with a direction. You may only be 60% sure about your conclusion, but choosing a good action moves you forward.