BOYFRIEND ADVICE! Will sex save our relationship?

My ex boyfriend and I started dating in late December and lasted until late January until we decided to take a break. This "break" was his idea and we have been on a break for about 2 months and now he wants to get back together and I do too. I have been thinking about having sex with him or giving him a BJ because I have been told by family members that no relationship lasts without sex. I don't know if I'm ready for that yet but I do want to save our relationship! I am torn up as of what to do! I need advice asap plz!!!