do I get back with my ex?

okay so I’m in need of some serious advice, my ex cheated on me with 2 girls..... I never forgave him. Now that we’ve sorted things out after about 8 months or so, we are getting back into the talking stage and unfortunately I’m realising how much I miss him. I have noticed a good change in him but I’ll always be scared that I can’t trust him and that he may be off with other girls. Like I said, I always get the feeling of missing him but do I give him another shot???