I was dating a girl for 1.5 years. She's a 10, to be sure, although she has her personality flaws.

We broke up because another girl sent me photos that I deleted from my phone, but not before she saw one as it was coming in.

We have been seeing each other as "friends with benefits" for four months now, which is great. I would love to be in a stable relationship with her again, but I am also enjoying sleeping with other women, and she said that she is "dating four guys".

I asked her about that and she said she was not sleeping with those guys, just "dating" them, and that she learns a lot about men, since they are younger than her.

Anyway, we went to a halloween party together with friends, a friend's birthday party, she threw me a birthday party, have hung out together and have sex a lot, and we agreed to spend NYE together. She asked me three times if I had paid for a hotel room, and I did, and she mentioned that she was not getting me a Christmas present this year, which was fine, and I didn't get one either.

She showed up late on NYE, with her suitcase, after saying she had to work another party late, and that she was hungry, and wanted champagne in the room. She acted like a bored hooker, but I took her suitcase to the room, poured her champagne, broke into a balcony so she could smoke, etc.

I asked her about her new anklet/ankle bracelet, and she said "that's a christmas gift". She told me how much she loved it.

While smoking, and then later, on the dance floor, she seemed distracted, and the short story is that we took photos together, and while she gave me her phone a text came in saying "happy New Years Eve to you also and I miss you too." So I sent one of the photos of us to the guy that sent the text to her.

Midnight, cold kiss, and we go up to the room. She tells me I have to move her car while she smokes. I move her car in 5 minutes and she is freaking out when I return about her phone. She has her suitcase packed, and has changed out of the lingerie she was in, is dressed, and with keys in her hand - all in 5 minutes.

Huge fight, she brings up everything from years ago, she says I told you we were just friends, and doesn't remember saying she wasn't sleeping with anyone else. I told her I guess I'm stupid then, and we stare at each other, like a staring contest, for 10 minutes, and she storms out when the other guy drives to pick her up (she is drunk).

I contact an alternate plan B girl, and I'm upset, but this other girl is 15 years younger than me, hot, with stamina, and we have sex five times and she says she loves me, wants to be in a relationship with me, gives me the hard sell as to why we should be committed, and wants to stop the much older man she is seeing. So we change our facebook status together and it's official.

Now, two days later, I'm processing this and I'm upset. If I breached some etiquette of dating by sending that photo, I'll accept that and I want to learn for the future. The new girl says that her boyfriend (who is married) is having a hard time letting go, and that she needs to give him breakup sex and then she can be mine and we can commit to our promise.

What am I doing wrong here? What lessons can I learn from this? I'd love to either be single and enjoying multiple women, or in a committed relationship, but this seems to be the worst of both worlds.

I appreciate your advice - I do - in advance. Thanks.