Advice

All right girls so I’ve been talking to this guy for seven months and we’ve gotten physical we’ve been hanging out a lot like were in a relationship and we act like were boyfriend and girlfriend but he has yet made it official I have a set of three-year-old twins who he has met and hung out with and we do not show affection around them but my girls of come attached how should I go about asking him if he wants to be in a relationship with me or should this have already been a discussion and any advice would be greatly appreciated thank you in advance