A bit scared wat to do ?

i'm married and have 2 kids very happy wit my life my husband is very lovin and caring i love him too very much but recently i met one of my friend on face book we were friends when i was not married we had kind of liking wit each other he gave me his number but scared to call him as i think it may not be right we do chat on face book but i dont wanna be more personal wit wat should i do