Dreams about ex-partners can often reflect unresolved feelings or past experiences that are still influencing your current life. In your dream, the presence of your ex who is in jail might symbolize feelings of confinement or restriction in your current relationship or your emotions.

Hiding in closets can indicate a desire to conceal your true feelings, possibly about your past or your current situation. It may suggest that you're trying to avoid confronting certain emotions or issues. The transition to your cousin's house and the basement hangout spot may represent a shift in your support system or a need to reconnect with family and friends.

Seeing your ex's bisexual partner could signify confusion or concerns regarding loyalty and relationships. This part of the dream may point to feelings of insecurity in your current relationship, as you're worried about how your actions might affect your partner.

Overall, this dream could be a reflection of your subconscious processing past relationships, current concerns about fidelity, and navigating your emotions. It might be beneficial to take some time to reflect on what aspects of your past or present relationships need attention and whether there are any unresolved feelings you need to address.