Why would a guy enter into a serious relationship knowing full well he has feelings for someone else?

Anonymous

Im experiencing this right now with a few people in my life, he's what most people would say 'is always different around her' and clearly maintains some emotional investment for her as they have known each other for many years - but recently he entered into a pretty serious relationship with a girl he just met. They immediately became exclusive and moved in together within the first month of their new relationship.

He still insists on maintaining his these very odd interactions with this other person but I can see she is become hurt and confused by this and doesn't feel right about the kind of attention he gives her (very sweet, very caring, very vulnerable with her).

He disrespecting his current relationship giving another person this type of intimate attention and causing unnecessary confusion for another.. Why?

Why would a guy enter into a serious relationship knowing full well he has feelings for someone else?
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