Is it normal for my boyfriend to think that im going to cheat?

my boyfriend iss 44 im 22 but age doesnt matter but he has been cheated on in the past and 2 me I think he thinks im gonna cheat on him even though I wont as I've been cheated on too
and no how much it hurts
how do I convince him I wont cheat as I keep...

telling him but people who cheat keep saying they wont cheat and still do it any other way to convince him I love him dearly xxx

You need to sit down with him and explain to him that you will never ever cheat. Make a contract! Do a pinky swear! Anything to calm him down.
You also need to give him this ultimatum: if he ever is suspicious of you again for cheating after having this talk, you will break up with him.
Its not worth it to go through this relationship if he is never going to trust you. Without trust...whats the point? You should not have to struggle to convince him you wont cheat, otherwise its not a loving relationship, its just a lot of stress!

he's is twice your age!!!