Not sure what is going on

So basically I got sick laid in bed all day for a couple days, didn't miss work cause it was over the weekend. I went back to work and noticed my wife wouldn't kiss me good bye or hello anymore and stopped saying she loved me when she hung up the phone. I asked her the next weekend after work was over, what was going on? She said she is going to leave me and isn't in love with me anymore... but she said she still loves me. Confused and stunned, I realized this was serious. We talked calmly about it for a good couple hours. I had no idea why she still wanted to... considering 3 weeks earlier she wrote me a letter how we should have another child and what the benefits were. For the past couple months we were having great sex, it wasn't stale at all as it has been at times in our 8 year marriage. We have a daughter who is 6. Prior to Christmas, we got in an argument in which she physically attacked me, as I tried to leave. I defended myself and punched her in the stomach back, not hard, but just to back her off. She still came at me. The argument was over a picture of a model from a movie that I saw and was looking up on the internet 6 months previously. She never let me live it down. I looked at about 3-4 pictures of her, with her modeling bikinis and wearing regular clothes. I looked at all the actors and actressses of that movie, but that one stood out for her. I was just curious as to who they were.. never meaning to drool over anybody or anyone in the pictures. I never thought about it again until she saw my history and brought it up to me. She argued with me about it to the point of yelling at each other. I promised I wouldn't look at any photos like that again and haven't. She brought it up again and was relentless about it, prior to Christmas, and hit me twice, hard, before I struck back. I left immediately as I was trying to leave previously but she got in my way and physically pushed me. After I hit her back, I left and came back at midnight, after 5 jack n cokes. We basically got it back together for Christmas and our daughter... things seemed normal and were going good, then my mom passed. We were still being loving to each other and she wrote how we should have another child. We play wrestled together... everything seemed good, even though I was going through tough times with my Mom passing. We carried on having great sex and times out, dinner, movies, etc. A month after my mom passes, she lays this on me. SHe left for her mom's, mutually, after talking about it for a weekend. She couldn't stay there, she said she won't let our daughter live there. She came back, we end up having sex and I am trying to work it out sincerely and openly. I am not ignoring her but she is more less ignoring me regardless, except for sex at night and being rather pleasant but nothing too loving during any other times. Often she brings up how she is leaving. I once thought she was doing it because she loved the make up sex so much, but I don't think that at all anymore. She is serious. But she's confused. I don't know much else to do about what I can do for her. She has been very strict on my marriage and I did change alot for her. I let her watch whatever she wants on tv, I let her go where she wants , which she doesn't go much, but when its mutual if she wants to do something I have no problem with it. I am very easy going and also capable of planning my own fun times, so there's a good mix. I am loving and often play with her... Currently she is having a good relationship with me at home except for this looming over head, which she throws at me every once in awhile. She has yet to give me kisses good bye or hello, but is nice and pleasant regardless when coming home. We still do things as a family. But this doesn't seem enough for her, and really I don't know what is anymore. I am confused that she would still say she is going to leave, but she can't, financially at least. I don't know why she would intend to do it, we can have a good life together and we can constantly try to repair the marriage, but she doesn't seem like she wants to try. Even though things aren't bad, she refrains from making them great... What the hell is going on here??? Please help. She's 29 I'm 33.

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