Of course he still cares for her! He's not the "love rat" that everyone seems to have made out, and is really a nice guy who doesn't deserve all of the venom that has been directed at him. I hope that he is able to further his magician career in Melbourne and can't see any reason why he wouldn't be snapped up by a talent scout and pursue an acting career if that's what he wants to do.
Also, there has been sooo much made of the so-called age difference between Lawson and Cat - this is a bit of a beat up and if they find that the spark ignited in the BB house is still there for them in the real world (and it sounds like this could be the case) then I wish them every success with their relationship.