My wife is having intimacy issues since her pregnancy? Im afraid that my feelings will

[angel]

change for her.? My Fiancee and I have been together going on 5yrs now. We just recently had a beautiful new born baby. our Daughter is now 7months old. I enjoy sex very much with my wife but things have changed dramatically. I do understand that she has gained some weight from the baby and I've never put her down about it. actually I think its cute. Its been a long time since I last felt the chemistry in our sexual relationship. most of the time I feel she's just giving me sex only because Im nagging about not getting any so then she says something like "tomorrow I promise". This has made me feel very insecure about myself. I sometimes wonder if its me that she's no longer into. I sat her down plenty of times and spoke to her about my feelings and it goes into one ear and out the other. My wife works a 8 to 4 job, and we have a daughter which is another job. I cater to this woman and treat her like a queen. I just want to be appreciated but I also feel i should be taken care of in the intimacy part of our life; especially cause I chose her to be the woman Im going to be with for the rest of my life. Its sad to say but I have thought about leaving her but Im not sure if this is a valid reason for leaving. I don't want to regret leaving her. Its 100 times harder because we have a Daughter together. I truly love my wife but cant seem to grasp her attention. I spend allot of time ignoring her because thats my way of getting back at her for all the times she's turned me down. Im sick of it all anyone got any suggestions??? Please Help...