The amount and degree of physical contact, flirting and sexual teasing in some instances suggests a level of comfort with each other. This however is a little tricky as ex-sex can be very tempting even for people who have no intention whatsoever of ever getting back together. So don’t assume that because someone is getting all “hot for you” that they are emotionally warming up to you as well.
The amount of physical touch, flirting and sexual teasing should match the level of emotional connection, otherwise your ex may just want sex only.
