<human>: Could you distill the essence of the text into 1-3 sentences?

More of a question to the crowd in general, I guess. Is it common to be invited to the wedding of an ex? If you have, did you end up going?

I was dating "Karen" some years ago. The breakup was messy at the time (she cheated on me, then we hooked up for a while as FWB before we both stopped and got into serious relationships with other people), but since then we've become reasonably good friends who talk online once a month or so. 

Karen started dating a new man last year and accidentally wound up pregnant. She had her baby at the beginning of this year, and has since been a SAHM. She and her boyfriend seem to have had a somewhat rocky relationship (which makes sense with an unexpected pregnancy among college students), but he proposed a few weeks ago. Wedding invitations just went out and I was somewhat surprised to receive one.

I'm on good terms with the bride-to-be and her family, but I'm not sure if it's customary for an ex to come to the wedding. There's no lingering romantic attraction between the two of us, and my current SO most likely won't have a problem with me attending (though if she unexpectedly does, I'll decline the invitation). 

I don't know if the groom-to-be knows that Karen and I used to date (I also took her virginity)... I'm thinking his knowledge of the situation might be the key to the answer, huh?

So... what would /r/relationships do?
<bot>: Dated a girl some years ago, broke up, but remained on friendly (and platonic) terms. She sent me a wedding invitation. Unsure if husband-to-be knows our past. What do, Reddit?