Maybe a cheater?

So ever since my partner started at his new job (he’s been there about 5 months), he’s been getting a lot of raises and promotions to the point where it’s suspicious. When he’s home he’s constantly on his phone texting his boss, and whenever his boss is working he goes in a half hour early (but goes in right on time when his boss isn’t there). He always seems preoccupied and has had no interest in having sex since he started there.

His boss does about everything in his power to avoid me when I go to his workplace, either for a ride home or to pick up dinner etc.

My partner swears he’d never cheat on me and that he’s straight and “doesn’t swing that way” but it all seems kinda suspicious to me

** for reference my partner work about 27.5 hours a week, I work 42.5 hours a week, if anyones gonna get burnt out I don’t think it’d be him