How can someone love you but won't commit?

So since July I have been in and out of a guess relationship. Sold me the moon and stars. Everything was great. He started showing other woman a little bit more attention and I called him out on it. Then we split up. This nearly did me in. I fell for him harder than any of my relationships in the past. I'm talking even the 9 year ones didn't affect me as bad as this one. We stopped seeing and talking. Every now and then he would send me little messages like hope you are doing well blah blah. Then dec 10 he asked me to come back to him he confessed he messed up. So I did. Once again I bought the moon and the stars. The last couple weeks the talking was lesser. He didn't want no company when I wanted to see him. I know a girl at his work confided in him over her relationship with her guy. Since then he been distant. Well today he said I love you but just not ready to be in a committed relationship. WTF dude. So I was prepared for this already but I have the weight back against me chest. Told him his not worth wasting my time or energy nor my heart. And to not contact me no longer. I guess that chick didn't even know about me. But I'm over it I just don't understand

How can someone love you but won't commit?
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