Marriage help needed!

My husband and I have been married for 6 years, together 11. We have a lot of differences and built up frustrations. He's fed up with me and I'm fed up with him. I'm so depressed thinking about living the rest of my life with him. I want to travel and I hate the thought of traveling with him. Is that selfish? I haven't always felt this way, but I've been unhappy since marriage. We have a 4 year old. She's the light of our lives. We love her so much! If I would have been willing to give her up 1/2 of the time, I would have left my husband.

So- we have a friend. He's my husbands friend, actually. Over 10 years, we've become closer to him. He lived with us for 3 months. He's really attractive and awesome. Just a really cool guy. He holds the same values as me and treats me with respect. I've never (I mean 0%) been interested in him... until recently. The more I grow apart from my husband, I become more interested in his friend! He's super loyal, which is why I like him so much. He will not add me on snapchat/ social media. He won't respond to normal, everyday texts. So, he's out of the question but I totally have a crush on him! I love the way I can be myself around him without negativity. No nitpicking, no abusive words like "why won't you just think for once in your life?" I hate who I've become with my husband. If I'm so unhappy in my marriage, should I just go ahead and move on? What about my child? My house? How do people make these decisions?