Help. Married 8 months ago and having barn fun with a stable boy who works for husband?

I'm a 25yr old woman. I got married 8 months ago. My husband is 56 and is away on business alot. Hes a good man. I have everything most woman only dream of, fab house, my own car, i dont work, my days include gym, spa treatments and shopping. Marrying him was a really good optino for me. BUT not in every area. Hes seriously lacking in the bedroom. I've a very high drive and with other men i found they could satisfy me much more....more energy to keep it going and just more horny for me. I've a great bod, i've huge tytts (natural) and the sight of them has been enough to make most guys want to give me a royal seeing to. But they seem to nothing for my husband...and that makes me feel very unwanted. I'm afraid i'm now getting that attention from a fit gorgous 21 yr old who works for my husband looking after the horses. Its happened numerous times in the past month...and usually outdoors. However i made a big mistake. I went out to him dressed in stockigns, suspenders and walked into the barn, only to be met by a different worker. I bluffed my way out of it saying i wanted to surprise my husband....everyone knows hes away for 3 weeks. Help...am really worried, will the staff gossip? I'm getting filty texts from a new number....... He wont give up texting me and usually i end up going out (never do it on my husbands house) and we end up screwing for hours when the rest of the staff arent around. Please help me though. I'm really worried, dont want to lose my marriage.