My girlfriend love sex but last 10 yrs she doesn't want any

I have a fiancé who when we got engaged she was so happy . I asked her a few weeks later that I like 3 promises . 1 3 children she has 1 who is now 17 ( father unknown) 2nd be faithful .3rd I always be there for her . I kept all of those promises even when she was gravely ill I styed at the hospitial sleeping in the car not to be to far from her . her daughter thinks I a cool dad as she know me since she was 5 we always have fun but never treated her as a child even when my father met her I got dirty looks but she prove them wrong the 17 yr old name is patricia she like trish .but her mom during a partically torn appendix I asked the doctor to check her tubes as she told me they were cut and burnt . then cut . then never cut . I was told they were just cut and tied . and a easy surgery I set up the appt 3 times and she canceled the appt . when I asked she get upset she is bi polr but since a change in her meds she more open . I feel I being played and becoming depressed as I want children but she says ys but noting happening in the bedroom I done her birthday , holidays special she likes it but then when it time for us to be close . she loses her desire and her vagina when she tightens down she has crushed my erection even bruising me and now if I do finger her I can barely get 2 fingers in . I love her but I want kids I told her make a decision she says she will so far no change I planning to break it off by end of sept unless I don't want to but I don't know how to make her want what she love and enjoyed so much now NOTHING

I feel if she did promise you and you agreed why shouldn't she been happy to if you got well with her daughter who she never knew her real and call you her dad . if she doesn't want to care for the children you want have a lawyer write a contract station you will care for them and handle you medical bills