<human>: First post from a long time lurker because I really need some help, so mind if my post is less than stellar.

So we were dating for about a year and month before things started going sideways. everything up to this point had been freaking amazing and I dumped my soul into her. About this time things got weird. she seemed distant always at work and tired and never in the mood for anything. Eventually to compensate she wanted to start hanging out with friends. I had no problem with this I figured she just needed to blow off some steam. fast foward another three months I would rarely see her for what I called five minute days. Basicallly wake up, go to work, change and go out again. I also noticed she had been drinking when she went out. Of course all of this set off red flags, i'm not proud to admit I went through her phone a few times just to see what she was doing because she would blatenly not talk to me. Finally it just came to an end one night when feeling insecure I went to her phone and found she had been talking to a guy I had previously told her I did not want her talking to and it became to much and we ended it. Fast foward a week post-break up, I ended up running into one of our mutual friends. somewhere along the lines he mentioned he had turned her into a bit of a pot head... hold on... she told me she only did drugs once.... (she's also been popping adderal) so getting suspicious I asked straight foward had she ever cheated on me and he admitted she had let a guy eat her out once while high.... I lost it. All this shit suddendly came out, shes been abusing alcohol, using drugs, smoking and cheating... (I supected she had cheated more but only had proof for another instance) I immediately went to her facebook, closed it, drove to her fathers and let him know who she had become. One because I was pissed and two because despite it all I still love her and in my mind she needs help.... she's fucking her future up and a promissing career just to party...

Could you distill the essence of the text into 1-3 sentences?
<bot>: girlfriend of a year and four month started acting weird and broke up with me. Found out she was really into alcohol, drugs, cigarettes and had cheated on me atleast twice.