<human>: My fiancé and I have been together for 4 years, before he and I got into a relationship he had 2 other girlfriends, one he was with very briefly(like a month), another he was with off and on for a 1/2-2 years. He was with the girl he had a longer relationship with first, with her 3 months after they got together he cheated on her for about 1-2 months (making out with another girl multiple times during a week for those 1-2 months). This girl has no idea that he had cheated on her to this day, the second girl that he dated brief, he went to a dance with another girl and ended up kissing her that night, he later broke up with the girl he was with and stayed single. Then about a year later he and I got together and I trust that he has and will be loyal. 

At the beginning of our relationship, he lied to me about something small, and since then I have trusted him but there has always been that thought at the back of my head, and sometimes that leads me to worrying that he will cheat. (i believe that regardless of how strong a relationship is, this will go through everyones head at one time or another, even more so when they have a cheating past). He understands why I get concerned about it, but I would much rather NOT be concerned about it, i'm not sure if I should try to go to therapy or couples counselling, or just try to get over it myself (it's not like I sit around crying over it, i think of it rarely, but when I do it gets to me)

Can you provide a brief overview of the text?
<bot>: Fiance has a cheating past, and there are some points where I have been concerned and worried about the possibility of him cheating on me.