Most Helpful Guy
This is one of a billion reasons why LDRs don't work.
The escort issue is just a symptom - the problem is that relationships are about SPENDING TIME TOGETHER - and if you can't do that, then your emotional and physical needs aren't being met, yet you're having to do even more work and making more of an effort than you would in a normal relationship. That imbalance causes people to either let loneliness overcome them, or causes them to lose interest and lose their emotional connection.
LDRs simply aren't realistic. ALWAYS DATE LOCALLY, because virtually all LDRs fail due to reasons directly related to the distance/time apart.
Most Helpful Girl
No you shouldn't be okay with it. I've heard of guys asking for to use an escort service because they were in a long distance relationship, but he lives an hour away from you and you see each other every weekend, this really doesn't seem like a reasonable ask from him. Also, if he truly liked you, he wouldn't want to have sex with someone else, he'd live with just masturbating during the week. If you don't trust him, you should break up with him, a relationship can't survive without trust.