Something fairly trivial in the scheme of things happened to me last night with my ex and has left me pissed off. The same situation is very likely to occur again and I was wondering if you thought my plan was the best way of dealing with things.
Backstory is that I was with my ex for 10 years between the age of 14 and 24. In that time, I got a degree that I supported myself through, worked 2 jobs after graduation to make ends meet (all day in office and then waitressing at night) and began a professional career. He left school at 16, briefly went to college before dropping out and then never had a real job (got sacked after a week's trial as a barman because he couldn't hack it, walked out of a job in Homebase and and a job in a warehouse as he thought he was above them). Instead he did odd work for a friend of a friend designing websites and other bits and pieces for whatever pie in the sky idea he had that month. Sometimes he was paid for this (usually about £50 a week) but more often than not the bloke used to take my ex off for nights out and pay for erverything.
Although we had other issues it was mainly he lack of motivation and ability to grow up that resulted in me splitting up with him just over 2 years ago. I wanted to leave good few years before we split up but found it difficult as he was still very much in love with me and I knew ending it would devistate him.
Since the breakup I have never felt anything except for relief and wish I had found the strength to end it much sooner. I deliberately avoided entering a new relationship as I wanted to learn how to be single. He got a new girlfriend quite soon after we broke up and moved in with her not long after. In the time since we split up with have stayed in touch from time to time (an email every 4 months or so) just seeing how the other one is but have never met up. His sister and her bf live at the end of my road and I see them from time to time at the shops etc and have always said hello and exchanged chit chat. My DM happenned to bump into ex's sis's bf on Saturday who mentioned to her that ex and his gf have had some problems in their flat and have moved in with him.
Anyway, yesterday when coming home from work the bus was crowded so I was standing at the front by the driver. As the bus thinned out a few stops from home I sat down and noticed that ex and his new gf were sitting at the back of the bus and were chatting to each other. We should have all got off at the same stop but I ex got off a stop early. As he was getting off the bus he caught my eye, I smiled and did a quick wave but he turned his back on me and completely blanked me 
His face didn't look surprised to see me and I think he must have seen me get on the bus. He then didn't walk past my house, which would be the obvious way home but instead walked a long arse way around deliberately to avoid me.
I know it's small but it's really pissed me off. I have done nothing wrong and am not some dirty little secret to be swept under the carpet. Now they're living so close I'm sure I'll see them again, especially as I think his gf was on her way home from work, so obviosly commutes on the same journey I do and want to know what to do for the best. I don't want to tell him I'm annoyed as I'm sure he'll twist it that I'm upset as I still have feelings for him but if I ignore him I feel as if I'm complicit in a lie.
I was thinking if I see them again just to go up and say 'hi how are you? You must be x nice to meet you (to gf).' What do you think?
Sorry for the lengthy rant but it has unexplicably got my goat.