So you’re basically brushing this under the rug until he decides he needs more attention but doesn’t actually talk to you about it? It doesn’t seem like you’ve actually addressed the communication issues.
Having more date nights is good, but without solid communication to address the underlying reasons your partner would go on a date with a woman he met out of town, those issues are unresolved and it could happen again, or continue to happen.
Presumably he knew the boundaries before. A reasonable person knows that if you’re in a committed relationship it’s inappropriate to meet someone of the opposite sex and take them out for dinner and drinks. So what caused him to do that and tell you a story that didn’t really add up? Did you have a state of the relationship conversation to find out? Did you share your wants and needs with each other?