I turned to hurting myself physically

I found out that there's this girl that my ex boyfriend cares about a lot...So I got pissed off and then I cut myself and I busted open my hand...the only reason why I got so pissed off is because he said when we were together that he would always...

love me and he didn't want to lose me but the thing is that I dont get how someone can say that and then break up w/ the person...and the thing that really gets me is that we haven't even been broken up for that long I'd say about 2 1/2 to 3 weeks tops...I mean how can I tell if he really meant what he said when he told me he loved me...I dont think that its really that easy to get over someone that you tell you love and you want to be with them forever and whatnot in that amount of time...or was I just a waste of his time...I know he's going to get pissed off at me when I told him I cut myself and busted open my hand I know I shouldn't tell him that I did it but I can't lie to him...No matter how hard I try to not tell him something I end up telling...What can I do? Please help me soon before something worse happens....PLEASE

It's good to be honest and all, but you might scare him. wellz if this is normal thing that you do, you should seek proff. help. it seems like you still have feelings for him...