How do I get him back? Or should I just leave it alone? 10 pts for best answer :)?

Alright so I still live with my parents and me and my mom got into a fight. Me and my family aren't close so my boyfriend was the closest person to me. Which is a shame. But anyways I have so much going on and if I would have stayed with him then it would have SMASHED our relationship. At first he said he understood. And we decided to be broken up but still together if that makes sense. And then I found out he was talking and texting other girls. We argued a lot. And I didn't sleep last night thinking of how I wanted to express my feelings to him. So I texted him a 3 page text message telling him how much I love him but can't be with him right now. And he text back and all he said was "k". And i saw him this morning and he just walked right by like he didn't know mw. I don't know what to do Im hurt! What should I do?