Ended my relationship by text

I have been in a relationship for 9 months and today ended it on text and I feel terrible for doing so. I mean it feels really disrespectful and I'm so not like that. We had a great relationship in the beginning but it somewhat changed after around 7 months. I started feeling like a stranger and could not deal with the unkept promises. Sometimes we wouldn't see each other for at least 2 weeks. I still do love him but just feel like I couldn't continue with it and needed my space. When I said I needed to talk he would avoid me for days. Nothing was fun anymore and it felt like we were an old married bored couple! Recently he's done nothing but irritate me with his stubborn behavior. I feel like i've hurt him as I haven't heard from him since the text 8 hours ago and I know he finds it hard to deal with situations. Why am I feeling so bad as for the first time I put myself and my needs first? I want him to be happy but I didn't think it would be with me. Have I done something really bad and horrible?