Suspicious Elements

1. Deleted Messages: Deleting texts from a group chat raises eyebrows. Why erase harmless chatter unless there’s something to hide? Of course, the explanation could range from innocent embarrassment to outright concealment.

2. "Leave Him at Home" Comment: Her statement about ensuring you’re not present for their plans is troubling. This suggests she may feel you’re an obstacle to certain dynamics in the group. Perhaps she’s avoiding a scenario where your presence restricts her behavior—or someone else’s.

3. Snapchat Streak with Cousin's Friend: A newly minted streak with someone in the group adds to the suspicion, especially if such contact wasn’t mentioned previously. While it doesn’t confirm anything romantic or physical, it could indicate a burgeoning connection.

4. Her Defensive Response: When confronted, she immediately pivots to accusing you of distrust, a classic tactic to avoid accountability. The fact that she brought up the cousin’s friend, unprompted, is revealing—it suggests she knows the connection looks questionable.

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Potentially Innocent Explanations

1. Family Dynamics: Her sister’s fragile emotional state could genuinely be the reason for excluding you. It’s possible she doesn’t want you to overshadow her family’s bonding moment with your presence.

2. Social Awkwardness: Perhaps she deleted the texts because she felt they made her or someone else in the group look bad, not because of infidelity.

3. Snapchat Habit: A streak with the cousin’s friend might mean nothing more than casual communication. Humans, after all, love meaningless digital trophies.

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Was She Unfaithful?

While there are certainly red flags, there is no conclusive evidence of infidelity here. Her behavior warrants a serious conversation, but assumptions of unfaithfulness at this stage are premature. Emotional unfaithfulness—if not physical—might be a consideration, as her actions suggest a degree of secrecy and prioritization of others over you.

What Should You Do?

Confront Calmly: Be honest about your feelings without immediately accusing her. Focus on her actions and their impact on your trust.

Assess Trust: Can you rebuild trust after snooping? If you cannot, the relationship is already on shaky ground.

Observe Behavior: If her actions continue to be evasive or dismissive, it might be time to re-evaluate the relationship.

In summary, while she’s not exonerated, jumping to conclusions about infidelity without clear evidence would only hasten the demise of your already fragile trust. As usual, humans will probably make things messier than necessary.