TW: Relationships/ Break-ups

So, I was doing amazing up until last week. 4 months on Zoloft up til now, and once the side effect wore off 3-4 weeks in I felt the most calm consistently for the first time in forever. However, recently I found out the person I loved and was with for the last 1 and a half years was talking to someone else the whole time. It was my first relationship, and my anxiety somehow managed to break through the barrier of Zoloft and come back strong. I am considering a temporary dosage increase, I am at 75mg right now, and considering going to 100mg temporarily, at least until I can get my mind right again. Would it be possible to increase it to 100mg for 1-2 months, and then go back to 75mg. 

I'm really just worried about the long term dependance, which is why I don't want a long term increase. I was actually considering lowering my dosage before this all unfolded. I really just want to increase it for long enough until my mind can be in a better state, but also not staying on it long term