From what I understand of an "open relationship" there are essentially two situations:
1) the girl and guy are not sure if they wanna commit so they keep it open for a while. Which if it lasts beyond 2 months someone is bound to get hurt.
2) They are basically just there to have sex with each other, while continuing to flirt/sleep with other people. This situation could work if both partners are not the type to get emotionally attached.
To be honest your relationship fits neither bill, if you guys love each other...why is the relationship open? Plus to expect romance or durability out of an open relationship is expecting to much. If you are not having sex, or talking, then there really is nothing to the relationship. Plus there are many guys who woudl give you plenty of attention, good sex, love and much more, and guess what you won't have to share it.
Long story short...if it's sex you want, talk to him, if it doesn't work out...bounce, if it's a relationship you want, um he's not the kinda guy for it...so run...and don't look back