Most Helpful Girl
I think if it's been 5 months and you're still not over it, it's something that won't heal.
In my relationship something similar happened, not as bad as your situation but of a similar theme, and I was so heart broken. But, after a couple of months I began to forgive him and the situation slowly began to repair. It's not cheating in my mind, and your situation doesn't sound like cheating either, but it definitely isn't faithful behaviour and it boils down to what you can/can't get past unfortunately.