Desperate need of advice.....

Hi its 4:30 am, and my head is spinning.  My husband and I are trying to put our lives back together.  We seperated in Feb of 2014.  We have been on again and off again.  But something always pulls us together.  I had dated a man for almost a year before we broke it off and he had been dating a girl on and off since 2015.  We enjoy our time together, we laugh and talk.  We texted everyday.  We parent our kids together, but the passion is missing.  Sex is always been our downfall.  He said he finds me attractive still, but when we are alone without our kids there is nothing.  We both think this relationship is worth us putting the extra effort into, but we are stuck on how to respark our love life.  Looking for suggetions as what has helped others in this situation. 

I understand the baggage needs to be left at the door.  Which I have no problem doing.  He has asked for two weeks to see if he has a wall up, if we could seek outside help.  Please help...... Desperate to fix this situation.  And yes I have done some wooing.  I sent him flowers, I cooked for him, I showed up at his house in a sexy lingerie.  So I am really at a loss.  Once its gone is it something that you can get back???????

Thanks,