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I hate people like this. They deny your solutions, and you end up feeling like shit when you can't help them. You're not in the wrong here, not one bit. Mathew just seems like an attention seeker. You're right. You're not his therapist, and you shouldn't have to feel obligated to try and help. What I would do is tell "Mathew" that you won't always be there to help him, that he needs to turn to therapy because you might not always have a solution for everything. You could also tell him that some of the things he does makes you uncomfortable.. and that you'd like to remain mutual. If you do say those things, I would try and block him since I personally think he'd try to apologize a lot, but end up repeating the cycle when you stay 'friends' with him. I'm sorry this is going on, people like Mathew are just.. really creepy and weird, so I hope anything I said could help in some way! <:- )
Really, he said his parents thought he was crazy so he didn't know who to trust, but either way I think therapy wouod do him loads of good since I genuinely do think some of the reasoning behind his actions may be due to his mental health, not saying it excuses it though. And that drama regarding the weird comments, I told him for at least an hour, and sent him a few pretty long messages explaining I feel uncomfortable with his weird comments, that were just friends and will stay just friends, and that he needs to get his crap together pretty much, but atp it felt like he just brushed it off since there was other stuff distracting him, he did apologize yes and he did exactly what you said he would, he just moved it to that alt acc which is shitty tbh, but yeah it did help, gave me a bit of closure knowing I'm not actually a jerkwad and people understand my situation 😭