Dating advice!!!!!!!!!!!!!!!!!!!!!!!!…

So how long does it take to get over an ex? Because its been like 3 months since we've broken up and I still want to hang out with him, and snuggle and date him. I don't know if he feels the same way but he is leaving for college in pa soon. Also whats the oldest you should date? I have liked this guy I work with for 3 years but I want to go out with him. Hes 29 and Im 18. I know thats a long time range difference, but he is so sweet and i like him. He says i look beautiful even without makeup, and he told me i looked breath taking last week. so what do i do ? is it wrong to have feelings for him ? I dont know im all messed up. Also i went on a date with this guy and i nabbed my friend with me, i gave him a hug goodbye and i dont think i like him. should i give him another chance? i haven't told him yet what should i do?