He certainly can. I’ve covered this in a previous frequently asked question. If you are female and have a vaginal yeast infection, there is certainly a bigger chance that your boyfriend or partner may contract this. While thrush is not necessarily an STD or a sexually transmitted disease, it can be transferred through sexual contact, oral sexual contact, for example.
So if you are a female and do have a partner and are concerned, make sure that you clear your thrush. At least get it diagnosed to make sure it’s not bacterial vaginosis. It’s really good to try and understand what you’re dealing with, so you’ll be in a better position to eradicate it.
Bacterial vaginosis is very common. I’ve covered that in a previous FAQ as well. But, yes, you can pass a yeast infection on to your boyfriend and he, in turn, can pass it back to you. Something I call pass the parcel. So it’s good to get on top of your vaginal infection sooner rather than later.
So I hope that covers that question quite well. Thank you.