The out come will all depend on a few things. Are you willing to compensate to stay with him even after the fact? If so then you may have a chance.
Step2
Your going to have to stay calm and relaxed. I know that might not sound easy, but it helps, alot. Tell him that you know what has been happening, but that you still love him. Tell him you want to work through it.
Step3
Try and see if maybe your not still giving him that exiting feeling, and you may have to try and get that back. After time, you see each other day in and day out, you do need a break. or a change.
Tips & Warnings
the best thing you can do is stay focused and calm, and communicate. make sure you know how the other person is feeling.