
I’m not a man, but I’ve read the thread and I’m going to stick up for the OP and other single Catholics because a few years ago I was one myself and I think it’s far too easy to forget what it was like.
Attending Mass with your family and friends is very different from attending as a single person in a new parish. If you’ve never had to do it (regularly) then please just trust me on this! Of course, our focus should be on the Eucharist and the joy of coming to Mass, but for anyone who is already perhaps feeling a little lonely and downhearted about finding Mr. or Mrs. Right, it can also be a profoundly isolating experience if you let your focus lapse.

I can confirm as a married woman, my concentration can still lapse now and then during Mass, but maybe that’s just me!!!
As a single 30-something, or even 20-something, especially living away from family and friends (or at least, Catholic friends) it can feel just plain lonely being a Catholic and being single.

I want to congratulate the OP for having the guts to go to Mass alone every Sunday and stick to her values because we don’t do that enough for our single, young Catholics.
Of course it’s easy to fall into a sort of speculative daydream about someone who is male, a suitable age and actually attends Mass and even takes an active role in the parish. For many Catholic singles, that’s like the Holy Grail

Yes, it’s wrong to get carried away with the daydream and to speculate and wonder and let those amorous feelings grow, but that definitely does not deserve to be labelled ‘odd’ or ‘weird’ or symptomatic of some sort of communication disorder. The man in question, likewise, does not deserve to be labelled a ‘creep’ for doing his job.
What about the other parishoners? Have any of them stopped for a chat or done anything to make the OP feel welcome? If not, they ought to!
Looking at all this another way: I attend Mass without my husband because of his work commitments and my commitment to other relatives who are in need (and that particular Mass is the only time I get to see them) I wear my ring with pride and I’m 100% committed to my marriage.
If I noticed a single man or woman close to my age group (and I’m in my 40s but still a youngster compared to most parishoners) who was new to the church, I’d go and say hello and at least give them an encouraging smile because in a few years’ time, most of the congregation will be dead and I want to keep the parish going and have some support! Maybe the man in the OP’s post is just trying to be friendly and figuring out how to introduce himself and help her find her way in the parish without coming over as too enthusiastic and being misinterpreted?