Dreams involving infidelity and feelings of betrayal, like your boyfriend cheating, can often reflect deep emotional turmoil and insecurity in your waking life. The act of trying to drown yourself in the dream may symbolize feelings of being overwhelmed by these emotions, or it could represent a desire to escape or eliminate the pain you're experiencing.

Your father's role in saving you is significant; it may indicate a longing for support and protection during difficult times. This could suggest that you have people in your life who care for you and are willing to help you through your struggles.

Overall, this dream may highlight your feelings of vulnerability and the need for emotional support. It might be helpful to explore these feelings further, whether through journaling, talking to a trusted friend, or seeking professional guidance. Remember, it's important to prioritize your mental and emotional well-being.