But if he has been a WOMANIZER, that is very different. Guys who have many one night stands - that tells you something about their character. They don't care about people's feelings. And moreover, if they tell me that they're not SORRY about what they did, but all of a sudden they happen to now be 5x namaazi (I kid you not, one of the recent guys I was talking to was like this), that should be a warning sign. It means they are a HYPOCRITE.
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its not a question of they 'dont' care about people's feelings, at best yu can say they 'did not' care about people's feelings. However, the girls they are having the one nighters or even short reltionships with would also not be looking for anything serious so there is no issue of anyone's feelings there. it would be different if a dude led some chic on and then had a one nighter with her and dumped her. That is usually not the case. believe me, of my 5.5 years of undergrad that were mostly spent in a fraternity house....majority of the action going on there was not between people who were looking for shadi and bachay...they were just looking for bootie call, guys as well as girls.
and as far as being sorry, why? i mean for what reason, sorry because you 'did not care about someone's feelings?' or sorry because you did something which is against what your faith etc or belief system that you got more into, or converted into. Also is sorry here meaning regret or being apologetic. two very diff things, one can have regrets for something they did, but they dont have to be apologetic about it.
it does not make anyone a hypocrite. People change for better or for worse..depending on whose lens you are looking at it from, them holding different views than they did years ago does not make the a hypocrit, but points that they have changed as an individual, now had someone been sleeping around while at the same time yip yaping about it being bad, that there is a hypocrit.
PS: oops, did I say too much :D