married but feelings for another man :(

I am 24 and have been married to my husband for 5 years we have been together for 10 years we have 2 children together I started working 1 year ago and became really close to a guy who is 45 he is sweet funny and kind he is also married we have been close and lately I've started to have feelings I love my husband but I don't know what is going on with my feelings the guy from work invited me to go watch him play music and he played a lot of love songs and stared straight at me every song he looks down my shirt if I have a tank top etc I feel awful for having these kind of feelings I don't know what to do! I have not cheated or anything we do flirt at work back and forth I just am so unsure about everything now help please. updated:::: Yes me and my husband have been together since I was 14 we met in school I appreciate everyone's comments the nice and not so nice I know it's wrong but it's how I feel my husband has changed a lot in the past few years he never wants to do anything or go anywhere period all he wants to do is work and sit at home I'm bord I am 24 and do nothing I work and stay home he don't like to talk or anything and I'm tiers of it I also work and take care of our kids this other guy makes me feel good and fun and all I just feel horrible for feeling this way