I have been with my DH since we were 18, 13 years now, and I find our relationship goes through phases. Every relationship ebbs and flows. Sometimes we are madly in love, other times we go through a tough phase and bicker and fight. We never stop loving each other even though we may not be in love at times.
Been tired as well really skews your thinking making it hard to feel romantic or attracted to anyone when you are just grinding through the day. I think you need a break!
I believe you owe it to yourself and your partner, especially with kids involved, to try and make it work. Relationships are hard work. You need to have a good chat to him, and find out how he is feeling too. Personally I don't think the text was rude, it sounded to me like he is really unhappy, and doesn't know how to speak to you.
Maybe counselling would help. But communicating with each other is the essential start. Some time alone to rediscover why you were attracted to each other in the first place.