Convenience or True Love?

So my partner and I have been together now 10 years. He recently confirmed what I knew 8 years prior. He had cheated on me with a 19yo girl he worked with at the time. (I know for a fact without him telling me how long the affair lasted and how many times they were together. I can almost tell you dates.) He blames the drugs he was taking at the time and the events that happened. (He was sexually assaulted at the workplace) I know it was cause some female looked his way an wanted him. I know it is the only time it has happened. I am still with him cause I love him despite his f'up. I am more full of rage than I ever have been and part of me wants him to hurt like I do but I also don't want to hurt him. Are we still together for love or convenience?

What would your thought process be?