Good sizable period post marriage has passed. You have defined one side story and hence it would be difficult to pinpoint issue. In such cases other person's behaviour is directly proportional to own behavior. Identify what was earlier and what elements are missing, have you maintain same physique and nature is question. Sone points : May be some work related stress?.. How he is emotionally attached to kids? What quality time u spend together ?
Try to 1st do analysis and correct rest, we r here to help.
Best wishes.
Next Steps
Analysis basis above suggested points and yes honest feedback from other partner would enable to understand core issue.
Health Tips
Avoid showing hote dislikes / neglects / unhappiness on issue which might worsen situation.