Was my ex pretending to be a different man online to trick me?

I had a friend who I’ll call Tom. Not his real name. Tom and I agreed to wait until finishing our studies, for a year, to date. We agreed to be exclusive. Tom told me later that he’d been seeing other people in the meantime and that he had me as a backup plan. I cut contact with Tom and started trying my luck with a dating site.

A few weeks later, I received a friend request, from a man who claimed to be the same guy that I knew, Tom, except he said that he’s not Australian from a posh suburb. This man said that he’s got a different name and that he’s a white Algerian businessman, trying to settle in my state. He said he’s lived here for one year and he proposed marriage to me.

I wasn’t sure what was happening, but I had a bad feeling about whatever was going on, so I blocked this person. This happened a few days ago.

I know for a fact that the guy who is definitely Tom attended my Autistic social group but grew facial hair and came and joined my table, hoping I wouldn’t recognise him. Then he started talking and Tom has a very unique voice, so I knew it was him. So did the host. This also happened a few days ago.

So, I am not clear on what was going on here. Are Tom and the Algerian guy online likely to be the same man, or was it coincidental that I came across another creep around the same time that happened to resemble Tom in appearance and lied about being the same guy?

Updates
3 mo
I’m not trolling. I know there are some really strange people online, so it could be coincidental. Tom looks Australian and there is a record of a real person by his name, on Facebook and on the school studies board, on the year of his graduation.
Was my ex pretending to be a different man online to trick me?
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