He studies in a mixed environment and when he interacts with his female classmate she doubts his actions

The learning environment am in forces me to be close to this
particular sister in islam. I treat her with all da respect a muslim
brother should give to a sister. However she doubts most of my actions
to her, and most of my favours to her, even though she acceptsthem
sometimes. please note that I dont do this very often or in a manner
that would suggest evil thoughts. This behaviour hurts me,considering
the fact thatI know I am very much sincere in all that I do to her and
I have no bad intentions. I always think of explaining this to her but
the only thingthat stops me from doing so is the hope thatmaybe by
enduring the pain to myself I'll have a better reward infront of Allah
in akhera, I haven'tfound another choice. Is there any or shuold I
stick to the one I have?.
Praise be to Allaah.
Free mixing in schools, universities and other places is haraam
because of the evils and negative consequences to which it leads. This
has been discussed previously in the answers to questions no. 1200 and
50398
The one who is faced with that and cannot find a school or university
that is not mixed has to fear Allah, lower his gaze, and keepaway from
women and talking to them, let alone making friends with them, except
for when there is a real need to talk to them, in which case he should
talk with them only as much as is necessary.
What appears to be the case from your question is that you are not
compelled to do these things, in addition to thedoubt that it causes
in this sister's mind. Hence what you have to do is give it up and
avoid this girl and others, and remember that if it werenot for the
need for education, it would not be permissible to you to remain in
this mixed environment.
If you can change to a study group other than the one in which this
sister is, then do that. If not, then refrain from these interactions
that are making her doubt you, and keep it to the minimum of
interaction between you.
We ask Allah to forgive you and to protect you from evils both
apparentand hidden.
And Allah knows best.

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