What is this guys reasoning for getting women pregnant?

My niece recently found out that she is pregnant, she's still a teenager in school, and said she was not planning on getting pregnant, and was so gullible as to believe her boyfriend when he said he is on male contraceptive pills and they can't get pregnant, he told her that he also does not want any kids, and is not ready for it himself because he is only 23 years of age, but when she told him that she is pregnant and won't be keeping the child he said that it was murder, but since it is her body he will help her find abortion medication, 4 months go by and he has made every excuse in the book to her on why he cannot get anything, worst part we only learnt after all of this that she was hiding a pregnancy, and couldn't do much at the time.

Recently we have found out that this is not the first school kid that he has gotten pregnant, and that several other girls in their last year of school fell pregnant because of his lie to them about male contraceptive pills for some reason, and he has been begging them to keep the child but none want to, and most went to get an abortion.

The man does not work, he lives with his mother, and gives all the women empty promises, and won't be with them after they get rid of the child and has never introduced any of the women to his family.

Any thoughts as to why he does what he does?
What is this guys reasoning for getting women pregnant?
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