Im Sorry you feel like this i tryed to stop a couple of years back and its hard work to not harm yourself you should feel proud of yourself for that and as for going back thats normal because the thought of it going away never leaves you..Have you tried alternatives to hurting yourself you may get a beter realise from that..
Draw on the area of ur body u wnt 2 cut with a red pen
or
wearing an elastic band and pinging it when u feel the urge
Pm me if u ever need to talk