Thought of extramarital affair

We have been married for 4 years now. Since we have moved here I feel he doesn't pay attention to me anymore. The only thing we do together is watch tv for an hour or two even if he's home all day, he doesn't feel going out so stays on his computer all whole time, sometimes engaged with our kid. We have sex rarely like may be once in a month. 

Sometimes I feel so so lonely! I don't have any family or friend here, can't go out with the kid alone frequently because of the cold unpredictable weather (my kid has asthma prob) I just feel so unwanted n sad!

Sometimes I feel like I wish I had someone who would pamper me praise me show love to me surprise me do adventures n make passionate love to me caring about my needs! I have tried discussing my depression with my husband, he listens quietly, the next day he intendedly tries to have sex but then it always go back to the same old routine again! Sex is also very boring, not much foreplay to make me enough wet not enough time to have an orgasm. I know sex is not everything, but I just don't feel loved! Sometimes I even look for signs if my husband is cheating on me! Nothing so far, but sometimes I have a feelings if he's gay?! We had a love marriage so is it possible by any means? 

I feel really sad all the time! Any suggestions?