My partner has stayed every night with me for the last four weeks. He has his own flat which he goes to when he finishes work to get cleaned up and changes,(he's a lorry driver). He brings round his work clothes for the next day but otherwise he leaves his clothes there and all his post goes there. We sleep in the same bed eat meals together and occasionally go out but he says we're not living together. Are we in a committed relationship or is he just using me. Thanks