Is it normal to think about kissing your ex?

Is it normal to fantaize about kissing your ex? Our relationship was amazing. We had so much fun, we fit together perfectly and we really beer fought. Our whole relationship was like a gag worthy rom/com. We took walks, stayed up all night talking (even when we lived together) looked at the stars blah blah blah. We broke up because it wasn't the right time for us. We were both hurt and we stayed friends (honestly, it is possible) but te relationship we had (the intensity I guess) was to much for where we were at the time. (First year of college) Either way I eventually met someone else, got married and now have a baby. But I still think of my ex and our relationship. Not sexually. Just our relationship and him kissing me. I talk to him every now and then (the hubs knows, he trusts me, we also have a good relationship) but I've obviously never acted on my thoughts. I enjoy being his friend.