Hello. I can see that you have been trying to find reasons to try it with him. He may not be the ideal partner for you, and you may be afraid that you will hold on to his faults and regret it. You may also be afraid to introduce him to your friends. You may not be sure if he is the one for you. From this, it seems that you have a lot of uncertainty about your feelings for this guy. The emotions that need to be convinced to find reasons to try are relatively passive, a bit reluctant to give up, but not enough to love.
You are single and don't seem to have made any definite commitment to a relationship with this guy. From this perspective, it is your freedom to attend the mixer. You are worried about how the guy will react and what impact it will have on your relationship, so it seems that the root of the problem is still with you and this guy.
It might be helpful to take some time to think about what your ideal partner would be like and what kind of intimate relationship you would like to have. Then, you can consider what this guy is like and whether there are ways in which he could improve. Do you think these shortcomings can be made up for through his efforts? What changes would you like him to make? Is he willing and able to cooperate? Also, are there any ideal needs that you feel you are willing to give in/compromise on?
Perhaps it would be helpful to consider whether there is any possibility of narrowing the gap in the future.
At the same time, you feel quite happy spending time with him, and you care about his feelings. You are concerned that not cherishing him enough may cause him to leave. For this part of "care" and "reluctant to let go," you might consider what factors are involved. For example, is it more because he is good to you and has given you a lot, so you are reluctant to let go of the care you already have?
Or could it be that you have been persuading yourself to try it, and you have actually put in a lot of effort?
It might be helpful to consider whether this "care" and "reluctance to part" is more related to the past six months or the future. For instance, it could be that you're concerned about the possibility of losing him in the future, which would be a significant loss. Alternatively, if this is more about the past, it could be a factor of "silent cost." Either way, it's important to understand what's driving your feelings.


Comments
I understand the dilemma you're in. It's tough when you have feelings for someone but also have doubts. Maybe it's worth considering what you truly want from a relationship and if he aligns with those values. If you're leaning towards giving him a chance, perhaps talking to him about your concerns could help clarify things.
It sounds like you're at a crossroads where you're torn between exploring other possibilities and deepening the connection you already have. Have you thought about expressing your uncertainties to him? Sometimes being honest can lead to a better understanding and might even strengthen your bond.
The fear of missing out can be overwhelming, especially at 26. But remember, quality over quantity. If you decide to attend the networking event, try to go with an open mind, not just to compare but to genuinely meet new people. However, be mindful of your current feelings and respect the trust you've built with him.
It's important to listen to your heart, but also to your head. If you're finding more reasons to stay than to leave, maybe that's a sign. Trusting your intuition can guide you in making a decision that feels right for you, whether it's pursuing this relationship or exploring other options.
You mentioned that you're afraid of regret. Regret often comes from not trying. If you feel a growing fondness for him, maybe the fear is actually a sign that you should give it a shot. Relationships require effort and compromise, and sometimes the person who isn't perfect on paper turns out to be the one you need.