Co-workers girlfriends

I love working in HVAC and plumbing. The job is great. The only downside is some of my coworkers’ girlfriends.
For some reason, a shocking number of them seem convinced I want their boyfriend, or think it’s weird I work with them.
I barely speak to these guys outside of work. The one time I did, I invited a coworker AND HIS GIRLFRIEND to my graduation party. When I got back to work the next week I heard from a different co-worker his girlfriend was very upset about me inviting them. Apparently inviting both people is now suspicious.
This isn’t even new. When I was 16 as an apprentice, I got paired with a 20-year-old licensed guy. His girlfriend was convinced I was after him. Like to the point where she was arguing with him over text because I was in the van with him. (It was also like my second say meeting this dude)
And at work it’s gotten to the point where if I’m on service or an install these guys won’t even mention to their girlfriends I’m there too! Like at lunch the other day we’re all at the shop and this guys girl calls him and he says “oh yeah I’m just at lunch with male co-worker 1 and 2” even though I was on the job with him the whole day lmao!
The best part is they always assume I see the same version of these guys that they do. I don’t. I spend all day listening to them say the most sexist, disgusting, and questionable things imaginable.
And honestly I think if they heard what their boyfriends are saying about them and women in general I doubt they would want him either!