In my honest opinion, i can't see it working, if you can hack it go for the long distance relationship, if not make a clean break of it, i really don't think the half and half thing will work at all. There is always the chance you will find someone at uni who you prefer. Just the thought of your boyfriend going with another is gonna hurt like hell cos you know he's your boyfriend but you also know he's gonna be sleeping with someone else and despite the fact that you can sleep with someone else too, that thought going through and through your mind will pierce like a knife, trust me.