I wouldn’t know. I didn’t say that.
Having heard this, my only advice to you is to get out NOW while you still can. Apparently she values a false sense of obligation over love. Think about what this means for you. Either:
(a) You sweep her off her feet but she feels such guilt about her other relationship that she ends up marrying him and dumping you;
or (b) Same as above, but she marries him and carries on an affair with you, meaning she’s got two men doting over her while you’re left chasing a carrot you can never have;
or (c) You sweep her off her feet and she drops the other guy for you, and for as long as you’re together you’ll be wondering whether she’s only staying with you out of a perceived obligation and whether she’s seeing anyone else.
Any way you cut that turkey, you’re screwed. Maybe I’m a little biased–last year I ended up in a relationship that had elements of all three, and it left us both with a lot of painful baggage. He was neglecting her badly when we met and sparks flew, and then she dumped me for him and he turned into a super-sweet, sobbing, sensitive gentleman and won her back–now I’m alone and he’s even more of an asshole to her than before, being that much more secure in his ability to keep her under his thumb, so she’s even more miserable, not to mention bitter. I carried a lot of bitterness from that for a good while. It took me a horrible fling with another girl–the only girl (out of six total) who ever failed to make me come during intercourse–to get over her, and that fling left a lot of hurt feelings on the girl’s end because she was way, way more into me than I was into her. I’d seen stereotypical men trying to get out of women’s beds as soon after sex as possible on TV, but I never understood it until I had that rebound fling. It was scary territory–I’d never imagined myself being that dude, and the fact that a rough relationship could turn me into that was a distressing realization.
Long story short, you can wind up seeing a lot of hurt feelings all around with this thing. I’m no expert, but if I were in your shoes–knowing what I learned in my last relationship–I would wait until your lady friend demonstrated a desire to get her emotional priorities straight, and maybe not even get involved then. I don’t want to be with a woman who would marry someone she didn’t love, and in the future I plan to cut and run at the first sign of that. But hormones are powerful. Just watch your ass out there, soldier. And I still agree with Queuing in that you need to either shit or get off the pot.
BTW, are you aware that if the Other Guy was born in Puerto Rico, he’s already a US citizen and doesn’t need to marry her? If she doesn’t know this, that’s a HUGE red flag about the dude’s ethics and the dudette’s gullibility.

