Need some serious advice...don't know what to do

Basically I've been dating my girlfriend for 4 years, and last May I broke up with her due to the fact that things had been going downhill, and I didn't want our relationship in general to get to a point where we hated each other...she took it really bad, then 3 weeks later I realized I wanted her back, and she thought about it for a day, told me that she had started seeing someone else, and took me back...we were together again for 3 weeks, and she hit me totally out of the blue and broke up with me, saying that she wanted to figure things out...I told her I would be waiting for her...6 weeks later, I had just started to get over her, and I made out with a chick...I told her this, and she was a little upset, untill she told me that she had fucked an old ex of hers...I was mad, but I forgave and we got back together...things were ok, and then 6 weeks later, she hit me out of the blue AGAIN and broke up with me...I was crushed, and convinced myself not again, it wasn't going to work...a week later she tells me shes sorry, and that she loves me, so I say "ok, but this is the absolute last chance, if it doesn't work this time, it aint going to work"...so for a few weeks things are good, then about the last week of November things start to go bad...she starts to never do anything...she never touches me, kisses me, tells me she loves me, or anything...I have to initiate EVERYTHING, she also confesses to having fucked a different guy 4 times while we were broken up...we go a week without talking, non-stop fighting, etc...so we talk about it, and figure out what we need to fix, etc...things are good for a week, then start to go weird again...more fighting, and still the same issue of her treating me like a friend as opposed to a boyfriend...I let it go being that its Christmas time, and first week of Jan we have another HUGE fight about everything, and I told her how I needed her to actualy be a girlfriend to me, that I needed her to show me how she feels etc etc...I said how we can't keep having these same conversations and fighting all the time, she agrees and we try to work things out again...ONE day passes and we're back to fighting again; then we go another week without talking at all...we finally talk (last week now), and she says that she wants to break up again, so I say are you sure, she says yes, and I say are you positive, cause I'm not going back and forth anymore, if this is it, then this is it...so she says she wants to think about it...so while she's thinking, im thinking about how clearly it's not working, and maybe breaking up is infact the right thing...so she comes back 3 days later and says yet again that she wants to work things out...so considering what I had been thinking, I said I needed to think...So last friday we were suposed to get together and talk...she gets called into work (don't know why she couldn't have said no), saturday she says she has plans with friends but she would cancel, I told her not to being that if she decided not to go on her own and work sh*t out, then that would show that she truly wants to make it work...so regardless, she went out with her friends, and that takes me to now...I don't know what to do...obviously I'm seeing this through rose coloured glasses, so I'm hoping someone can lend their input on the situation...and thanks to anyone who took the time to read...I guess I just really need an ear (or eyes I guess) right now...

Hey I just read what you wrote and it sounds kindda like the same problem im going through but reversed. Well all I can tell you is that it was really hard for me to except everything and I know you are going through a devistating time in your life right now, so I will share with you a couple things that are helpipng me through my prob right now. WEll I think you need to think about what you truley want and if you can handle her doing this bull sh*t to you again. Is she really worth the pain you have been going through right now? Well what helped me realize that my ex didnt truley love me or care for me is that he slept with someone else with out even considering me, he actuall had the balls to come up to my house and f**k me then he said"you promis not to get mad" then I said yeah I guess (I totaly trusted him)then he told me he slept with jessica and he asked me to forgive him and it didnt mean anything to him. But of coarse I forgave him b/c I loved him and I didnt think anyone else would ever compare, but he did it agian then I forgave him etc the list goes on. But I think you need to look at the world around you and see what you truley desirve, I know there is someone out there that will be there for you but it takes time. I just think you need to move on but not with revenge do it because you want to. well I dont know what else to tell you you can write me back if you want at Fun mail me if you want to talk to someone