Sex drive weirdly low

Lately my libido has been very low which is weird for me because I’m typically the always cuddly and cuddly-turns-to-horny types. We live together and haven’t had sex in 2-3 weeks which is the longest we’ve gone without it. We still make out but I haven’t been suuuuper into it either. Whenever he’s about to go in, I tense up and we can’t do it.

We’ve also recently switched the brand of condoms we use idk if that is causing me to tense up and go dry real quick. Can condoms do that?

Is there and infection or something that makes you lose libido?