he’s getting bored

i recently found out my boyfriend sexted another girl like 6 months ago and ik it’s cheating and ik everyone’s gonna say i shouldn’t stay but please just respect my decision on that and focus on hopefully giving advice. how can i spice things up in the bedroom? we’ve done a good amount of positions and we’re very rough and aggressive which is good because we’re both really kinky but i’m just worried he’s getting bored. he doesn’t want to sext as much anymore and just seems off. any tricks you guys could give me to surprise him?