Like this post?
yeah it would be for me too. especially since you had told him in the beginning of the relationship that you would understand a slip but you just wanted him to be honest with you. and still he wasn't. this is the twisted part of it. and honestly, i don't know how you can ever trust someone like that not to go behind your back in hopes of never getting caught again. the fact that he admits he fucked up doesn't translate into him never pulling this shit again in the future. and him having sex without a condom is just moronic, not to mention completely uncaring of what happens to you.
i know guys like this guy, (never had a 1st hand experience like this though, so i'm not talking from experience), and a lot of them are not capable of being faithful, and most of them are flat out insincere about their cheating. they will look plain in the eye of their partner and lie about it. when the partner finds out they act all remorseful (and for all intents and purposes they are) and feeling sorry, but they are highly unlikely to change their behavior and will continue to lie about it. i don't know if your partner is like that, you're the one to assess him from that angle. if this thing continues though, mainly if LYING continues like this, i would say he's not worth the trouble. but it's your relationship, and you have to make your own decisions.
maybe give him another chance this time, but if it happens again, don't let yourself be led on by situational honesty.