Really upset

Im ttc and my husband sends me sexy texts from work. Then get hime drinks 3 beers then says hez tired he doenst feel like it. Im so upset it seems like every time during my fertile week he doenst want to have sex. I dont tell him when im ovulating but even when im not im lucky to get sex once a week. We used to have alot of sex now nothing. Its really bothering me and im considering cheating on him cuz its been so long that iv felt wanted or desired or attactive. I feel that sex is very important in a relationship and if your constantly being turned down. You reach your breaking point. Im horney all the time and i try to be sexy and seductive he tells me wait i wana finish my show or i wana rest after work so i wait then. Nothing. Im so fedup