Self sabotage

My boyfriend is amazing. We have such a healthy relationship. Yes we have our disagreements but not once has he ever disrespected me or made me feel bad. We just chat about whats going on and resolve it. Here’s the issue. I love him so much and I can’t see my life without him. I can see us together so far down the road and with kids etc... but I’ve been hurt a lot by men and therefor have some issues with guarding my heart to much. And I notice myself constantly trying to find flaws within our relationship etc and telling myself why it won’t work for us. It’s horrible and I want to stop doing this. Any tips?