My ex was in the dream and we were together. He got a cake from another girl I knew at his work. I felt like he was cheating and ended up fighting the girl then broke up with him.
Dreams about ex-partners often symbolize unresolved feelings or issues from the past relationship. The cake in your dream represents something sweet or tempting. Since your ex received the cake from another girl, this could indicate your fear of infidelity or feeling replaced by another person in your waking life. The fighting and breakup in the dream may suggest that you do not trust your ex in real life and fear being hurt again.
Overall, this dream may be a reflection of your subconscious feelings of jealousy and insecurity. It may be worth reflecting on your current relationships and identify any underlying trust issues that may need to be addressed.