Seriously, from what little you've shared, this guy sounds like a bit of a weasel.
You said something about how an open relationship would be better due to a lack of trust? Sustainable non-monogamy requires MORE trust, not less. You start as you mean to go on (well, i believe in that anyway). If you start with a lack of trust and poor communication patterns, that is the foundation you are building on.
But in all honesty, home boy sounds like a playa and something tells me youcan do better.