I'm a 25 year old male who has been in three serious relationships in my life (including the one I am in now), and I find myself overthinking/jealous at times. This has been something I've noticed about myself in all of these relationships, and it's something that has definitely gotten worse after my second relationship (due to borderline getting cheated on by her).

Even the littlest things make me overthink myself into a slightly "ehh" mood. Example: she went out for a drink with one of her girl friends the other day, and I saw there were other guys at the table when she sent a snap (her friend's friends they ran into I assume). This is just an example and I realize how ridiculous this sounds (I even feel stupid typing this). Of course I never address stuff like this, nor am I "controlling" at all. In fact, the only boundary I've discussed with her when it comes to friends of the opposite sex is hanging out with ex's one-on-one, that's my one real boundary outside of the obvious.

I'm a relativity attractive guy, dress well, have a great career and pretty confident in social settings. I'd consider myself overall a confident/happy guy, so I can't really put a finger on where this is all stemming from. I completely trust my current girlfriend and she's solid as a rock, but I have this habit of overthinking situations like these.

One theory I have is: I've been doing a lot of thinking about confidence lately, and I think I may be confident on paper (fake it till you make it), but I really need to dig down and build true self-confidence.

Anyone else have any other theories where this may be stemming from? I would really like to address the root cause of this.