Is two months too soon to move in together?

Every week a Guardian Money reader submits a question, and it's up to you to help him or her out – a selection of the best answers will appear in Saturday's paper. This week's question My boyfriend says I'm wasting the £400 a month I spend on renting a room and I should move in with him. I'm tempted – we're getting on brilliantly – but we've only been together two months. When's the "right" time to move in with a partner? What sort of ground rules should we have before living together? Or is love enough? What are your thoughts?