You probably already know this, but if you do get back on the Regimen, you'll need to start all over as though you were a brand-new user, get your skin reacquainted with the treatment. Be sure and start with a pea-size dosage and go from there. If your skin is mostly clear, you may be able to get away with only using one pump, or only doing once a day.

Yes i stopped in last december for a month and from january to now March, i had the worst time in my life. Breakouts got so much worst then i used to have

I stopped using the regimen since my acne stopped a year ago, but now the acne is coming back in full force. Which really sucks I went through really tough time last year but its starting to happen again :/

If most of your acne is gone as you said in your initial post and you aren't seeing an increase, you can certainly take the wait-and-see approach. If you notice the acne starting to increase, you can decide at that time if you want to get back on The Regimen.