Text Messages!

So my husband and I have been together for 8 years of those we've been married for 2! I have been in nursing school for 5 years (LPN graduate and soon BSN RN graduate in April) this has been very stressful on us individually and as a whole. Recently I found text messages on his phone while he was sleeping with a girl at work saying he can "step to the friend side" and "truly love you" and "an amazing woman inside and out" on top of which they call each other "love." I don't know what to do about this! I did call him out on it and he kind of turned the tables on me and said he needed more time with me and made it about the things I was doing wrong. Should I move on from this situation or should I move on with out him in my life any more? HELP!