It's challenging to determine the exact meaning behind your ex's actions without more context or direct communication. However, I can offer some possible interpretations based on common human behavior and emotions:
Curiosity: Your ex might be curious about how you are coping with the breakup and what you're up to now. It's natural for people to wonder about their former partners' lives after a breakup, especially if they still have feelings or unresolved emotions.
Regret or Second Thoughts: Seeing you with someone else may have triggered feelings of regret or second thoughts about the breakup. Your ex might be questioning whether they made the right decision, especially if they are still emotionally attached to you.
Jealousy: Seeing you with someone else could have sparked feelings of jealousy or possessiveness. Even if your ex initiated the breakup, they may not want to see you moving on and being happy with someone else.
Nostalgia: Memories of your time together may have resurfaced during the party, leading your ex to reminisce about the relationship and the connection you once shared.
Awkwardness: Your ex might have been unsure about how to interact with you at the party, especially if it was the first time seeing each other after the breakup. Their stares might have been a result of feeling uncomfortable in the situation.
Random Coincidence: It's also possible that the stares were unintentional or coincidental. People can sometimes get lost in their thoughts or accidentally make prolonged eye contact without intending to convey any specific message.
Remember that interpreting someone else's actions can be tricky, and assumptions may not always be accurate. If you're interested in understanding your ex's feelings or intentions better, consider having an open and honest conversation with them. However, keep in mind that both of you may still be processing the breakup, and it's essential to approach such conversations with empathy and respect for each other's emotions.