Another Man Was There (Where I Couldnt be) While My Daughter Was Born...... Im Going Crazy! HELP!?

I've Cryed so many tears.... I've talk to chaplains, combat stress.... my baby girl was born march 16 at 0700 am.... my daughters mom and I have been together on and off many times.... the reason we stay together is because we love each othere. a month ago we broke up for reasons we allways do. the baby was suppose to be born may 2nd. and she calls and tells me her water broke and everything. she was in labor i was on the phone with her... we didnt think she was gonna have it that night so i told her to get some rest and so will i. i woke up and no one contacted me until she had the baby. she had it that morning. and later i find out she was dating some guy... ******* X- Drug dealer. im in the military deployed to kuwait. he was there while my baby was born video taping the whole thing... i spilled my heart out to her...why she want to decide not to try again now... im so willing to work even harder now and so should she... there having visits to see OUR baby.. not his and hers.... i dont get it... she tells me she still loves me... despite all this i still try and i get the same answer. ive cryed to her so many times...... telling her we can be a family!!! i can provide for her and our baby... and now she says she just want to try something new and see how it works.... man i cant handle that... thats our daughter where suppose to be married in a house. we both did wronge things in our relation but im trying so hard to fight for what we have left!..... i dont know what to do.... shes letting me know theres nothing i can do but then she also says, its because im so far away and cant see me... we've havnt seen each othere since we found out she was pregnant... and maybe if i could get out of here and try. show up to the hospital spill my heart out to her and ask her to marry me. so we can start a family! i've never wanted this to happen to me! she says hes a nice guy.... and he gives her his time! she says i never have ever since i joined the military because she was against it... but she stood by my side for so long....and...soon as our baby is born?? she wants to do this??? she says it isnt fair to him to just let him go and to come to back to me.. but dont i desire another chance... for us and our daughter... she says.. she doing this for her happiness.. i told her i can make her happy and so much more... i just dont know what to do... and im here for 4 more months.... someone please give me some advice....