<human>: I was hoping you guys/gals could help me.. I (M18) have come to the realization that I have bad trust issues. I don't NOT trust her but I'm afraid to give my trust away because I'm afraid of getting hurt. 

A little background; basically my ex that I dated for about a year and a half was lying to me for months about someone who she claimed she hated but she was actually sexting and seeing them. That crushed me and I afraid to give away my trust. 

My current girlfriend (F18), who I've been with for about 10 months now, is amazing and is someone I want to share my life with but I feel like my trust issues are harming us. I know that when she tells me she loves me and only has eyes for me that she is telling the truth but in the back of my mind, I look back and think, "well she could be lying because the last one was", because of my past experience.

Give me the gist of the text in a nutshell
<bot>: I guess what I'm asking is how can I build a barrier from my nervous/scared/untrusting feelings so that I can be a better man for her?