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The thing is, some guys don't like commitment, but it doesn't mean they don't love the girl. A lot of guys when thinking about having a relationship and settling down, get scared since they don't want to lose their freedom. Some think they should experiment more, or think she's not the right one (in which others regret since they realized sooner or later that she was the right one) or maybe even think that they might not do the things they love doing again because they're with this certain girl. They want to keep on doing the things they love doing and not get tied down just because of this girl.
To answer your question, maybe this guy did love that girl, but he wanted to keep his freedom and didn't want a commitment. He's trying to move on and find someone else to distract him, but who knows? Maybe they're going to get back together. Some guys, when they notice themselves developing feelings for a certain girl, they back away since they can't handle it all at once and are afraid to take things to the next level, especially when they're young. But guys tend to get serious and would want to settle down by their late 20s or early-mid 30s. That's when they start to mature, and unlike girls, we mature faster, I believe.1THIS IS NOT RELEVANT ANYMORE