One of the best ways to know if she is trustworthy is in the kind of friends she keeps.
If you have met her friends and observed that they are trustworthy people, there is a good chance that she is trustworthy as well.
The same would also apply to her family.
If you have been around her family and you have noticed that the majority of them maintain healthy relationships in their own lives, there is a good chance that she is trustworthy.
Your instincts are typically your true self trying to send you the message of what you must or must not do.
You shouldn’t ignore your instincts because they are typically trying to warn you based on experiences that may not be at the forefront of your thoughts but are now lodged in your subconscious.
Oftentimes, our instincts talk to us and try to warn us but we ignore them because our hearts are pushing us in the opposite direction.
Being naive would indicate that you are trying to make yourself believe in stuff that is not necessarily true or that you are willing to simply go for whatever your partner wants or desires.
A relationship is supposed to be fifty fifty. There has to be a give and take for a relationship to work.
The danger is in when you assume all of the guilt and wrongdoing.
When you want him to open up to you so badly and see you as trustworthy, you may start trying to take the blame for some or all of what has caused him hurt in the past.
You may not even be aware that you are doing this.
You may act as though you understand his feelings and want him to see that you care and can be trusted but not realize that you may be excusing his behavior.
Your trust issues may stem from something that has consistently happened in past relationships, something that consistently happens in your current relationship or something that happened from your childhood.
In order to avoid these trust issues from affecting your relationship with your boyfriend, you have to figure out where they are coming from.
This is the first and most important task that you need to perform.
One of the best ways to know if she is trustworthy is in the kind of friends she keeps. 
No, it doesn’t.
Your instincts are typically your true self trying to send you the message of what you must or must not do.
The best way to know if his words are sincere would be to observe his actions and his history.
If she is in an exclusive relationship with you and is no longer on Tinder, you should continue seeing her.
It is better to be trusting.
You can use what you learn about their past relationships.
The danger is in when you assume all of the guilt and wrongdoing.
Your trust issues may stem from something that has consistently happened in past relationships, something that consistently happens in your current relationship or something that happened from your childhood. 
Yes, it is possible to learn