To pursue or not to... that is the question

I am in my mid-40s and separated. For the last 8 months, I have been exchanging messages with an ex-colleague and have really started to like him. We both agreed that we had potential to be more than friends and for the last 3 months, have met frequently and our conversations have been more oriented towards finding out what we enjoy sexually. The last time I met him, we kissed and explored each other with our hands. Since then, his messages have reduced. He did message me a couple of days after we met to let me know he is dealing with issues related to his child. I do know that the issue is serious. What I find confusing is why he's choosing to not talk especially given the timing ie right after we kissed. Is he no longer interested or is it my insecurity making me question it? Whilst I am attractive, I do not consider myself to be a great sexual partner. We have exchanged a few messages (initiated by me) and he does respond. I miss the lengthy chats :( I am also aware that he is making time to attend sporting events etc. He's just not making the move to chat / see me. Should I just let him be or pursue him?

You are right @susiedqq. Thank you. Your response helps me get some perspective.