Need help eliminating my trust issues

Hey, this is one of the first times I’m posting on Reddit, but I would really appreciate some feedback. I (20M) am dating my girlfriend (18F) and she is the most sincere, sweet, and understanding person I know. She’s truly so good to me. We’ve been dating since January (2025) and it has gone well so far, she loves me loudly. None of this has happened in my past relationships, but as of now she has bought a necklace that has my initial on it, she carries around a plush keychain of my favorite animal, and she talks about me to her friends pretty often. She even wears things that are blue because it’s my favorite color, and she always wants to be reminded of me. This is the first time someone has done something like that for me, so the fact that I’m not being kept a secret means a lot. That being said, back in February I noticed she liked an Instagram post, a meme that said “I miss liking someone now I’m just flirting and lying” which was posted on the 13th, I saw it on my explore page about 2 weeks later I’d say. It really made my stomach churn, I was nauseous but I managed to ignore what I saw and never brought it up to her (she most likely would’ve said a friend sent the post to her and she liked it impulsively). Some of the reels that I’ve seen her like are the type of reels that single people would be giving a like to. It’s partly my fault because I have been refusing to communicate to her how I feel about this, and at the end of the day they are just posts on the internet, so I don’t think I should be stressing to this degree. Another thing is, I’m not the type of person to check someone else’s following list but I caved in and I checked hers, and a good portion of it is just men who post thirst traps. So this really has me wondering if I’m enough for her, if she doesn’t like me as much as I thought, if she might have someone else she’s speaking to behind my back. Recently she’s been distant and at first it didn’t worry me, we were friends before we got into a relationship so I know she’s distant sometimes, but it has been making me overthink lately, she has also stopped telling me that she loves me. It just doesn’t feel like the beginning of our relationship anymore, like she lost the spark. This is probably the most embarrassing part for me to talk about, but on this other social media app she changed her bio and her banner to something about her male friend, “(Insert friend’s name)’s #1 fan” and the banner is a picture she edited that says “I ❤️ (friend’s name)” I don’t know if I’m overreacting for being a little bit skeptical and upset about that, it kind of hurt because she hasn’t said “I love you” to me recently. Genuinely this has been making my trust issues worse, how can I communicate all of this to her? She’s not the greatest at expressing how she feels either, but I hope our conversation goes well. But honestly, a part of me is considering breaking this relationship off.

TLDR: My girlfriend is great, but has been liking weird ish posts, follows men who are thirst trappers, has been distant recently, and I’m starting to think she might like her male friend. This has activated my trust issues, how can I go about this?