I think just go out with the relationship seeking guy on a few casual dates. Keep it at friends length. That way there is no deception. You are just seeing if you like him. If you decide you want to make it more, then you can break things off with HC. You dont have to tell this new guy any specifics regarding HC. If he asks, you can say "i am not involved in anything serious right now. Just casually getting to know people. However, I would like to be serious and exclusive with the right person"
