My take on this is he's saying if you're the cheating sort, at least be an honest cheat and treat the one you actually love well. Like if you're living this life on the road and you're not going to be a monogamous person, don't disrespect your partner by pretending you're going to be monogamous and expecting them to be so to you while you're gone. Then treat each other well and trust it doesn't mean there is no love. Then you don't have to remember the one offs or worry about their one offs. When you're together, be so good to each other you don't worry about whether or not you should trust.
It's not for everyone but it at least makes it more likely you're with a like-minded person.
My take on this is he's saying if you're the cheating sort, at least be an honest cheat and treat the one you actually love well. Like if you're living this life on the road and you're not going to be a monogamous person, don't disrespect your partner by pretending you're going to be monogamous and expecting them to be so to you while you're gone. Then treat each other well and trust it doesn't mean there is no love. Then you don't have to remember the one offs or worry about their one offs. When you're together, be so good to each other you don't worry about whether or not you should trust. It's not for everyone but it at least makes it more likely you're with a like-minded person.