
The reason why she isn't pursuing him is that she feels guilty and thinks that he doesn't want anything to do with her ,to her insisting on seeing him would be pushing his boundaries, that's why she's letting him go , also I'm not saying he's at fault but he came to his own conclusions,it's normal given the situation but he didn't try to listen to her ,which is understandable,the fl is in the wrong yes it's true ,but while she wanted to explain he ignored her ,anyone would think that he loathes her and wouldn't want to bother him anymore and for the thing about waiting days ,it's simply not the truth,he blocked her the day after then she sent a message and realized she was blocked it was later that he unblocked her ,secondly do you really think that he would directly believe what she says just after feeling betrayed? I think that excuses would've made him feel worse,also she didn't go silent first ,they both did

You are kinda making it sound like the ML is in the wrong. You said "he came to his own conclusions." His "conclusion" about her using him was completely correct. Him feeling like she never cared is understandable considering the fact that she played with his emotions. You mentioned that the ML came to his own conclusions, but didn't call out the MC for doing the same thing. You excused her because her feelings of guilt but didn't excuse the ML for his feelings of hurt. That is not fair. Trying something twice and giving up could hardly be called effort. She didn't care about boundaries when she wanted to use him, but now, she cares when it is time to explain. She could have said it in the letter.
Deciding whether or not to believe her is his choice to make just as chosing whether or not to explain is hers. Those are two separate matters. Even if he wouldn't have believed her, she still didn't explain. Thinking someone won't believe you doesn't relieve you from giving an explanation.
Yes, he hasn't make communication easy, but it is clear by his thoughts and actions that he is looking for some sign that she cared. One example being that he watched to see of she would turn around when he walked passed her to the elevator. He also doesn't have her on block all the time. The drawing showed him blocking and unblocking her several times in a day. If she tried to send another message later or after the incident, she probably could have gotten through to him.
I noticed that in stories where the Male Lead has been done wrong, the author still have the ML do the majority of the chasing. They also have someone close to the ML berate or bully him into taking action. I am a little sad that this is one of those stories.
I feel that there was so much more the MC could have said and done. Yes, he blocked her, but he did not block her immediately. It was her who waited days to contact him. She also could have explained things over the phone the last time they spoke. Yes, he ignored her, but how would he know that she, a reporter, was there to see him unless she said something. She has never expressed her intent to continue the relationship. She went silent first. She hasn't given him time to feel hurt. She is treating him like he has to forgive her immediately or cut her off immediately.
I have a lot more to say, but I don't know how to express it. I am just disappointed in the FL.