Have you felt unsure about your partner but stayed?

I started dating my now boyfriend at 21. I didn't really date much before him and sometimes I feel like I missed out on the whole experience. I love my boyfriend but what if we got together too young? I sometimes worry he'll get bored after some time being married (he said he's thinking of proposing soon). He was 20 when we started dating and in the past, I caught him being on tinder just to, "pass time". This was about 3 years ago and we haven't had problems since. He didn't go on any dates and we worked it out. I worry if he gets bored, he'll do it again. I saw the conversations he had with the girls and it didn't progress very far but I think that's because he doesn't have game tbh. I've gone through his phone here and there over the last few years (with his permission and he's given me his code) and haven't found anything. Maybe I'm getting cold feet now that we're close to marriage.
Have you felt unsure about your partner but stayed?
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