When did cheating on women and getting women pregnant become a black thing? I wish people would stop trying so hard to throw the word stereotype around.
Also, (and I admit, I've never done a Jacob romance), but does he really "cheat" on Shepard? You were going into a suicide mission. You might die. You might as well get it on. I don't see that being a lifelong commitment sort of thing, especially when one half of the couple gets place under military arraignment and you're on the run from your murderous ex-boss to stay alive.
Maybe I'm missing something, but every other companion seems to be, "Oh, I'd like to rekindle our romance, but it's been so long. What do you think, Shep?" (tee-hee, *bats eyelashes*, *acquiesces autonomy*). Jacob had his adventure with Shep, had a special one-night moment, lost her to circumstances beyond either of their control, and moved on with his life. He didn't pine endlessly for her. He didn't snap a chastity belt on his heart and on his junk until Shep gave him the "all clear" to cease being a love zombie. In a lot of ways, that makes him a much more realistic character to me than the majority of the LIs.
So this "he's a cheater" narrative really confuses me. Is there something to the way he speaks to Shep that makes him come across as a heartless cad, or is it just a bunch of spurned players who are heartbroken that their beefcake behaved a little too close to humanly?