Why did my ex ask me to lunch?

Anonymous
My boyfriend of four years and I broke up nearly 3 years ago. He has been in a serious relationship with the same girl since then. To my knowledge, they are still together. Last year around this time we met for happy hour and we have exchanged a few "catch up" e-mails since then. He asked me to happy hour a couple of months back, but I didn't think it was right because he had a girlfriend so I told him I didn't think it was a good idea. Last week he asked me to meet him for a quick lunch and I did. The conversation was great and we laughed a lot about old times. He never mentioned his girlfriend and I'm not sure she knows about our visit. My questions is, what were his intentions? Guys, if you were in a serious relationship of 3 years, would you pursue visits with an ex? I am starting to feel guilty about this.
Why did my ex ask me to lunch?
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