what should i do?

i been married with my wife for 4 years and we have 2 daugters 2.5 & 11 months old.. for the past 3 years our sex life has been terrible. my wife kept blaming it to the hormons and ofcourse i was doing my best to understand her. shes a home stay mom. i work 70 hrs a week. there was a lot of tense in the house, fights etc. we started having sex a bit more often but she only was doing it to please me, she didnt really feel it. as she said she loves me but not in love with me. a month ago she decided that we go on a seperation but still me staying in the house for our kids.we had sex a couple times and that kinda confuses things but what happen last week was we went out with other friends, i saw a guy grabbing her and went to his friend and told him nicely to tell him that i dont appreciate that (they knew we are seperated) and then she got all mad when the other idiot told her, she left the place drunk i didnt want to leave her alone, she kept yelling at me to let her go to her friends while we had our car there, i told her just let me drive you home and she left with a cab, or thats what i thought. seems that she got out of the cab and the other 2 guys (1 the friend of mine) gave her a ride. then she texted around 4.30 am the other guy if he d want to have sex with her. and ofcourse he did. she didnt tell me anything about it, but i had a gut feeeling and 2 days later went through her texts and saw she texted her girlfriend and told her about it. i went nuts and she said shes only sorry for me finding it out. shes not sorry that she felt having sex with that guy because it made her feel alive that she hasnt with me for almost 3 years. i consider it cheating. she said we were seperated . had i not got crazy at the club and told the guy what i said nothing prolly whould have happened she said. but she wont punish herself for how she felt. and she is happy to find out that it wasnt her hromones because she felt great and its something with us ...and i really dont know what say back to that. long story short i am trying my very best to work things out for our kids and because i do love her AND am in love with her, no matter what. things had been tough with us and i kinda had seen this coming but not this fast. she wants to give it a lost shot too for the kids, and because she wants to be happy with me, but doesnt know how to fall in love with me. any advice of what i should do would be appreciated

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