It’s understandable that you want to catch up with your old flame as a friend and see how he’s doing after all these years. Since you haven’t spoken since your last encounter, it’s possible that he didn’t message because he’s in a relationship and doesn’t want to complicate things, or he may simply be busy with his own life.
If you want to reach out to him to meet up as friends, you can send him a message or call him to see if he’s available. Be clear about your intentions and let him know that you’re not looking for anything romantic or sexual. If he doesn’t respond or declines your invitation, don’t take it personally. It’s possible that he’s not interested or may have other commitments.
Remember that it’s important to respect his boundaries and his current relationship status. If he does agree to meet up, keep the conversation light and focus on catching up as friends. Avoid bringing up any past romantic feelings or experiences unless he brings it up first.