That's over and I want to know if I can get things back on track.
What if you ditched the selfish "I don't want to fake it" attitude and resolved that love is just as much an act as a feeling?
You don't sleep with your husband (much if at all). You were gone enough to conduct an affair, so he probably suspects something went on. Yet he remains in the home. Assuming he does not have serious self-esteem issues (meaning he wants out but is afraid to leave), he seems like a pretty good guy.
How about you recognize this, be grateful that he's still around, and let that feeling of gratitude lead you to cheerfully rock his world. This is not faking it. If you can't see the circumstances and cheerfully give to him, you have some serious issues.
The best thing you could do for your marriage is to come clean, ask for forgiveness, and give to him what he deserves but you withhold from him yet gave willingly to the OM. Like it or not, you cheated on him and if you are honest with him (and yourself) you have to prove yourself to him. This is in addition to any personal therapy you need to resolve your own issues.
If it helps, think of this sort of loving sacrifice as practice for the rest of your marriage. Do you honestly think that this (or any) marriage will work if the sexual relationship is based on how horny you are for him? What if he based what he did for you only on what he felt like?
There is a thread around where a very wise lady has resolved to take a "servant heart" towards sex. This is instead of the more usual approach where ladies base sex off of "wanting it" and possibly putting the burden on their husbands to "earn" it instead of seeing it as part of the commitment of marriage. Read it and see if it is something you would be willing to try.