So, in sense & sensibility, Marianne dashwood forgives willoughby for abandoning her for miss grey and wealth. I believe she says something along the lines of “would he be happier? He’d have a wife he loves but no money…” basically implying love isn’t everything and being poor sucks.
with that said, it's horrible what he did to her, but if his intention was to marry elsewhere for money, it sucks, but it's understandable. Life is complicated, and it seems he is better off: he's now a lawyer and wealthy.
but the fact he's coming back and seeking her out now? GTFO of here. You don't get to do that.