Let's say you've been with your significant other for a year and a half. For 2 months you didn't have a title but were dating and taking things slow. A year and some months later you find out they were sleeping with someone else during this time frame. How do you react? Feel, etc? It's not really cheating but it almost feels like it disqualifies the whole relationship. Opinions?

I'd wonder why they were doing that if they had feelings for me, if they're more attracted to that person, if they're with me for the right reasons, and if they're a liar in general.

Good luck.

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gonna get my walkie talkie, and some mustard and some mayonnaise, and a mermaid, and some macaroni, bricks, and some telephone wires, and phone machines

Simsima, you say you found out about this well over a year ago (if I am doing my math correct) and its clear it still is bothering you greatly. To ME, if he is still with YOU after all this time then its YOU he wants to be with. How is your relationship? Has he given you reasons to doubt him? I would be upset too, BUT since I am an outsider looking in I can see better than if it was happening to me and what I see is that in that first 2 months he just wasn't sure what he wanted and you werent "officially" a couple yet. Have you discussed this stuff with him at all?

I agree partly with both the posts above. However, I don't think there is a way you should feel, you feel how you feel. If it bothers you, it bothers you. I think it'd bother me, though I think you really need to decide if it now means you don't trust him and it'll affect your future, or if it's just a bit less special that he wasn't as exclusive with his affections as you were when you first met.
If he's been great ever since you became official, I wouldn't imagine it's worth dragging up. If he lied about it or hid it, it's a bit more of a problem I would imagine.

Like i said though, you feel how you feel and i think you should either just feel a little disappointed, but be glad of what you now have, or discuss it with him if it's really changed how you feel.

mass homicide at the vegetable store