It sounds like you've been through a difficult and emotionally charged situation. Relationships can be complex, and social media often adds an extra layer of complication. Let's break down the factors at play and consider whether your decision to break up was justified.

Trust and Boundaries

Trust is a foundational element of any healthy relationship. When you discovered that your girlfriend had added multiple men on social media, it understandably raised concerns for you. Trust issues can stem from various sources, including past experiences, insecurities, or behaviors that seem to cross established boundaries.

In relationships, it's crucial to establish what is acceptable behavior regarding friendships and interactions with the opposite sex. For instance, while some couples may be comfortable with their partner having many friends of the opposite sex, others may feel that it crosses a line. If you had previously discussed boundaries about social media interactions, her actions might feel like a betrayal to you.

Communication Breakdown

Your decision to check her phone indicates a level of distrust that had developed. While snooping is generally not advised as it can breach trust and privacy, your actions stem from a place of concern. It’s important to communicate openly about feelings of insecurity or discomfort before resorting to checking her phone. For example, discussing how her social media interactions make you feel could have led to a more constructive conversation.

Her Reaction

Her defensive response and the subsequent deletion of interactions raise red flags. If she felt innocent, she might have been more open and transparent. Her reluctance to show you her activity log could suggest that she was hiding something or felt guilty. For example, if she had simply added these men without thinking much of it, a calm explanation and willingness to discuss it would have been more appropriate.

Deciding to Break Up

Ultimately, your decision to end the relationship appears to stem from a culmination of trust issues and lack of communication. If you felt that this behavior was a pattern that would continue to cause anxiety and distrust, breaking up might have been a healthy choice for your mental well-being. It’s essential to prioritize your emotional health and seek relationships where both partners feel secure and respected.

Moving Forward

As you reflect on this situation, consider what you want in future relationships. Establishing clear boundaries and open lines of communication is vital. You might also benefit from examining your feelings about trust and jealousy, as these can impact future connections. Seeking advice from friends or a counselor can also provide perspective and help you process your feelings.

In conclusion, while the breakup is painful, it may have been the right decision if the relationship was causing you significant distress. Trust and communication are key, and it's essential to find a partner who aligns with your values and boundaries.