You can tactfully say, I think you're a really nice person but friendship is all I seek. I don't want to get romantically involved, I'm not interested in you that way, and that won't change.

Men get rejected by women all the time. Men chase women, men try with many women, and get rejected by many women. You cannot sacrifice your own comfort level and well being to save their feelings. They will survive, and they are used to rejection.

Even with someone who has mh issues, they will be OK. Just because someone has issues, doesn't mean you now need to sacrifice what you want and need.

Assert yourself. Have stronger boundaries and watch out for yourself. It's OK to be direct and blunt, and that is honestly the only way to handle men who cannot take no for an answer.

Men will always hope there's room for something more. It's up to you to let them know that it will never happen, and you have to be firm and strong in your stance. I find it best to not even hang out with someone as friends who has hope for something more. It's almost leading them on.

But if they continue to harass and push, then simply unfriend and block. You don't have to deal with that, and pushing and harassing crosses over into disrespect. You've already laid down your boundaries, so if they push and cannot respect the boundary, you have every right to take take care of you well being and block them. Think of it in that way.

Self-care is number one, and that means having strong boundaries around men who pursue and chase you.