Congrats on getting back in shape!
It sounds like you might benefit from some rehab to address your concern about re-injury as well as the tension/tightness issue. I'm not sure where your concern about re-injury comes from--whether the feeling of tension makes you worried that it will re-rupture or if you're a bit gun-shy mostly from the previous injury. It sounds like you would like to do more, but don't feel that you can because you're simply unsure about what to do.
Depending on what kind of tissue actually ruptured (muscle or tendon), it's possible that you're experiencing tightness due to the rupture healing in a more contracted position--hence the feelings of tightness. If you ruptured muscle, then despite the reattachment, the new healed tissue would not be muscle, but rather collagenous tissue (almost, but not quite like having a tendon between the two ruptured ends). If you ruptured tendon, then your muscle would be intact and again, the new healed tissue would be collagenous tissue. Either way, it is important to mobilize the new tissue to force it to remodel in such a way that your injury restricts your activity as little as possible, and the best way to do that is to see someone who rehabs post-surgical repairs of ruptures--likely a physiotherapist. You should also possibly involve your surgeon (I'm surprised that you did not go through formal rehab post-op) to see whether this is the appropriate step for you, or whether you've developed some problem that might require revision (but usually that has more to do with healing in a stretched position rather than a contracted one).
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