I can offer some possible reasons why your ex-boyfriend might have texted you "Hey, how are you?!":
Friendly Gesture: It could be a simple and friendly attempt to check in and see how you're doing. Some people maintain a cordial relationship with their exes after a breakup and genuinely care about their well-being.
Curiosity: Your ex might be curious about your life and what you've been up to since the breakup. They could be interested in reconnecting on a surface level to catch up.
Nostalgia: Seeing or experiencing something that reminded your ex of you could have triggered the text. They might be feeling nostalgic or reminiscing about your past relationship.
Testing the Waters: Your ex could be gauging your response to see if you're open to rekindling a friendship or something more.
Loneliness or Missing You: Your ex might be feeling lonely or missing the connection you once had, leading them to reach out.
Closure: In some cases, people might seek closure after a breakup, and reaching out could be a way for your ex to gain that closure or resolve any lingering feelings.
Apology or Regret: It's possible that your ex wants to apologize for past actions or express regret for how things ended between you two.
Regardless of the reason, it's essential to proceed with caution and think about how you feel about the situation. If you are not comfortable engaging in conversation or if you think it could potentially complicate matters, it's okay to keep your distance. Take some time to consider your own feelings and boundaries before responding.
If you decide to respond, keep the communication light and friendly. Avoid rushing into anything and take things slowly if you decide to reconnect. Remember that it's essential to prioritize your emotional well-being and make decisions that align with your needs and desires.