This dream may symbolize unresolved feelings or unfinished business with your ex. The fact that you were hitting it off and having a good time suggests that you may still have positive feelings towards them. The presence of their family could represent a desire for acceptance and approval from them. The act of cuddling and sexual intimacy may represent a desire for physical and emotional connection with your ex. However, your subconscious reminding you to stop and not cheat on your current girlfriend suggests that you are aware of the potential consequences of rekindling things with your ex. This dream may be a reflection of your inner conflict between your past and present relationships. It could also be a reminder to address any lingering feelings or issues with your ex before moving on completely. Overall, this dream may be a sign to evaluate your current relationship and make sure you are fully committed and satisfied with it.