how can i overcome trust issues?

I think that you should tell him how you feel & tell him that you are jealous when he mentions other girls. That you feel the way you do. The best thing in relationship you need is honesty & trust. Without those, there is not a point being in the relationship. If he doesn't understand & just tells you to get over it, he really isn't a keeper. Or if you don't want to talk to him, be friend those girls he is talking about & find out if there's anything going on. One of my relationships i had, I was absolutely in love with this guy, and in the end he would talk about this girl. I thought nothing about it cause i convinced myself he loved me. A week later, he broke up with me and the exact next day, that girl and him went out. If you want to over come having trust issues, the first thing you have to tell yourself that you have a problem.

relationships rely heavily on trust. if he has given you no reason for you to not give him his trust, then you need to learn to fix that. However, he should be understanding, and for him to understand you, you must talk to him about your feelings. Trust relies heavily on communication. Jealousy can be a terrible thing if you allow it to fester inside of you. You need to be able to talk to him about it, let him reassure you. If there is no communication, there will be no trust. If there is no trust, the relationship will most definitely fail.