Sagittarius will not sulk too long after your breakup or overdramatize the events. They will simply go on living, but if you find out you cannot do without their help, feel free to contact them. Don't overindulge in seeking your Sag ex’s help, though – they value commitment and will stay committed to you for as long as you need them; this is not fair.
If you want to stay on friendly terms with your Sag ex, make an effort to stay connected. Remind them about important events, but make sure you do not take up the function of their personal little helper. In other words, stay committed, but keep a distance.