sex spic up

Nafsika
Advice for spicing up things in sex?
Im in a long relationship and im afraid that my partner is not attracted by me so much anymore. He has a low drive. We have sex everyb10 days and i think this i s alot time.
Im afraid he might cheat because of that. He hasnt say anything about breaking up and says that he just not in the mood but i dont believe him i feel that sonethi g is wrong
What should i do?.